Edgar Filing: CABOT CORP

SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
SCHEDULE 13D

Under the Securities Exchange Act of 1934
(Amendment No. 8)*

CABOT CORPORATION
(Name of Issuer)

COMMON STOCK, PAR VALUE $1.00 PER SHARE
(Title of Class of Securities)

127055101
(CUSIP Number)

SPO Advisory Corp.
591 Redwood Highway, Suite 3215
Mill Valley, California 94941
(415) 383-6600

with a copy to:

Alison S. Ressler
Sullivan & Cromwell LLP
1888 Century Park East
Los Angeles, California 90067-1725
(310) 712-6600

(Name, Address and Telephone Number of Person Authorized to
Receive Notices and Communications)

January 2, 2008
(Date of Event which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
Schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following
box |_|.

Note. Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7 for other parties
to whom copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

Page 2 of 43 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
SPO Partners II, L.P.
--------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_|
(b) |X|
--------------------------------------------------------------------------------
3. SEC Use Only
--------------------------------------------------------------------------------
4. SOURCE OF FUNDS
WC
--------------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) OR 2(e) |_|
--------------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
--------------------------------------------------------------------------------
7. SOLE VOTING POWER
9,413,100 (1)
------------------------------------------------------
Number Of Shares 8. SHARED VOTING POWER
Beneficially Owned By -0-
Each Reporting Person ------------------------------------------------------
With 9. SOLE DISPOSITIVE POWER
9,413,100 (1)
------------------------------------------------------
10. SHARED DISPOSITIVE POWER
-0-
--------------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9,413,100
--------------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
SHARES |_|
--------------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
14.4%
--------------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON
PN
--------------------------------------------------------------------------------

(1) Power is exercised through its sole general partner, SPO Advisory Partners,
L.P.

Page 3 of 43 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
SPO Advisory Partners, L.P.
--------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_|
(b) |X|
--------------------------------------------------------------------------------
3. SEC Use Only
--------------------------------------------------------------------------------
4. SOURCE OF FUNDS
Not Applicable
--------------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) OR 2(e) |_|
--------------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
--------------------------------------------------------------------------------
7. SOLE VOTING POWER
9,413,100 (1)(2)
------------------------------------------------------
Number Of Shares 8. SHARED VOTING POWER
Beneficially Owned By -0-
Each Reporting Person ------------------------------------------------------
With 9. SOLE DISPOSITIVE POWER
9,413,100 (1)(2)
------------------------------------------------------
10. SHARED DISPOSITIVE POWER
-0-
--------------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9,413,100
--------------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
SHARES |_|
--------------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
14.4%
--------------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON
PN
--------------------------------------------------------------------------------

(1) Solely in its capacity as the sole general partner of SPO Partners II, L.P.
(2) Power is exercised through its sole general partner, SPO Advisory Corp.

Page 4 of 43 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
San Francisco Partners II, L.P.
--------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_|
(b) |X|
--------------------------------------------------------------------------------
3. SEC Use Only
--------------------------------------------------------------------------------
4. SOURCE OF FUNDS
WC
--------------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) OR 2(e) |_|
--------------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION
California
--------------------------------------------------------------------------------
7. SOLE VOTING POWER
415,600 (1)
------------------------------------------------------
Number Of Shares 8. SHARED VOTING POWER
Beneficially Owned By -0-
Each Reporting Person ------------------------------------------------------
With 9. SOLE DISPOSITIVE POWER
415,600 (1)
------------------------------------------------------
10. SHARED DISPOSITIVE POWER
-0-
--------------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
415,600
--------------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
SHARES |_|
--------------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
0.6%
--------------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON
PN
--------------------------------------------------------------------------------

(1) Power is exercised through its sole general partner, SF Advisory Partners,
L.P.

Page 5 of 43 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
SF Advisory Partners, L.P.
--------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_|
(b) |X|
--------------------------------------------------------------------------------
3. SEC Use Only
--------------------------------------------------------------------------------
4. SOURCE OF FUNDS
Not Applicable
--------------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) OR 2(e) |_|
--------------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
--------------------------------------------------------------------------------
7. SOLE VOTING POWER
415,600 (1)(2)
------------------------------------------------------
Number Of Shares 8. SHARED VOTING POWER
Beneficially Owned By -0-
Each Reporting Person ------------------------------------------------------
With 9. SOLE DISPOSITIVE POWER
415,600 (1)(2)
------------------------------------------------------
10. SHARED DISPOSITIVE POWER
-0-
--------------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
415,600
--------------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
SHARES |_|
--------------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
0.6%
--------------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON
PN
--------------------------------------------------------------------------------

(1) Solely in its capacity as the sole general partner of San Francisco
Partners II, L.P.
(2) Power is exercised through its sole general partner, SPO Advisory Corp.

Page 6 of 43 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
SPO Advisory Corp.
--------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_|
(b) |X|
--------------------------------------------------------------------------------
3. SEC Use Only
--------------------------------------------------------------------------------
4. SOURCE OF FUNDS
Not Applicable
--------------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) OR 2(e) |_|
--------------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
--------------------------------------------------------------------------------
7. SOLE VOTING POWER
9,828,700 (1)(2)
------------------------------------------------------
Number Of Shares 8. SHARED VOTING POWER
Beneficially Owned By -0-
Each Reporting Person ------------------------------------------------------
With 9. SOLE DISPOSITIVE POWER
9,828,700 (1)(2)
------------------------------------------------------
10. SHARED DISPOSITIVE POWER
-0-
--------------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9,828,700
--------------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
SHARES |_|
--------------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
15.1%
--------------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON
CO
--------------------------------------------------------------------------------

(1) Solely in its capacity as the sole general partner of SPO Advisory
Partners, L.P. with respect to 9,413,100 of such shares; and
solely in its capacity as the sole general partner of SF Advisory
Partners, L.P. with respect to 415,600 of such shares.

(2) Power is exercised through its three controlling persons, John H. Scully,
William E. Oberndorf and William J. Patterson.

Page 7 of 43 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
John H. Scully
--------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_|
(b) |X|
--------------------------------------------------------------------------------
3. SEC Use Only
--------------------------------------------------------------------------------
4. SOURCE OF FUNDS
Not Applicable
--------------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) OR 2(e) |_|
--------------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION
USA
--------------------------------------------------------------------------------
7. SOLE VOTING POWER
-0-
------------------------------------------------------
Number Of Shares 8. SHARED VOTING POWER
Beneficially Owned By 9,828,700 (1)
Each Reporting Person ------------------------------------------------------
With 9. SOLE DISPOSITIVE POWER
-0-
------------------------------------------------------
10. SHARED DISPOSITIVE POWER
9,828,700 (1)
--------------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9,828,700
--------------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
SHARES |_|
--------------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
15.1%
--------------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON
IN
--------------------------------------------------------------------------------

(1) These shares may be deemed to be beneficially owned by Mr. Scully solely
in his capacity as one of three controlling persons of SPO Advisory Corp.

Page 8 of 43 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
William E. Oberndorf
--------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_|
(b) |X|
--------------------------------------------------------------------------------
3. SEC Use Only
--------------------------------------------------------------------------------
4. SOURCE OF FUNDS
Not Applicable
--------------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) OR 2(e) |_|
--------------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION
USA
--------------------------------------------------------------------------------
7. SOLE VOTING POWER
219,000 (1)
------------------------------------------------------
Number Of Shares 8. SHARED VOTING POWER
Beneficially Owned By 10,162,350 (2)
Each Reporting Person ------------------------------------------------------
With 9. SOLE DISPOSITIVE POWER
219,000 (1)
------------------------------------------------------
10. SHARED DISPOSITIVE POWER
10,162,350 (2)
--------------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
10,381,350
--------------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
SHARES |_|
--------------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
15.9%
--------------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON
IN
--------------------------------------------------------------------------------

(1) Of these shares, 109,000 shares are held in William E. Oberndorf's
Individual Retirement Account, which is self-directed, 100,000 shares may be
deemed to be beneficially owned by Mr. Oberndorf solely in his capacity as sole
general partner of Oberndorf Family Partners, a family partnership, and 10,000
shares are owned by Mr. Oberndorf solely in his capacity as trustee for the
account of his children.

(2) Of these shares, 9,828,700 shares may be deemed to be beneficially owned by
Mr. Oberndorf solely in his capacity as one of the three controlling persons of
SPO Advisory Corp., and 333,650 shares may be deemed to be beneficially owned by
Mr. Oberndorf solely in his capacity as a trustee of the William and Susan
Oberndorf Trust, dated 10/19/98.

Page 9 of 43 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
William and Susan Oberndorf Trust, dated 10/19/98
--------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_|
(b) |X|
--------------------------------------------------------------------------------
3. SEC Use Only
--------------------------------------------------------------------------------
4. SOURCE OF FUNDS
PF
--------------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEM 2(d) OR 2(e) |_|
--------------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION
California
--------------------------------------------------------------------------------
7. SOLE VOTING POWER
333,650 (1)
------------------------------------------------------
Number Of Shares 8. SHARED VOTING POWER
Beneficially Owned By -0-
Each Reporting Person ------------------------------------------------------
With 9. SOLE DISPOSITIVE POWER
333,650 (1)
------------------------------------------------------
10. SHARED DISPOSITIVE POWER
-0-
--------------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
333,650 (1)
--------------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
SHARES |_|
--------------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
0.6%
--------------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON
OO
--------------------------------------------------------------------------------

(1) Power is exercised through its trustees, William E. Oberndorf and Susan C.
Oberndorf.

Page 10 of 43 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
Oberndorf Family Partners
--------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_|
(b) |X|
--------------------------------------------------------------------------------
3. SEC Use Only
--------------------------------------------------------------------------------
4. SOURCE OF FUNDS
WC
--------------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) OR 2(e) |_|
--------------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION
California
--------------------------------------------------------------------------------
7. SOLE VOTING POWER
100,000 (1)
------------------------------------------------------
Number Of Shares 8. SHARED VOTING POWER
Beneficially Owned By -0-
Each Reporting Person ------------------------------------------------------
With 9. SOLE DISPOSITIVE POWER
100,000 (1)
------------------------------------------------------
10. SHARED DISPOSITIVE POWER
-0-
--------------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
100,000 (1)
--------------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
SHARES |_|
--------------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
0.2%
--------------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON
PN
--------------------------------------------------------------------------------

(1) Power is exercised through its sole general partner, William E. Oberndorf.

Page 11 of 43 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
William J. Patterson
--------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_|
(b) |X|
--------------------------------------------------------------------------------
3. SEC Use Only
--------------------------------------------------------------------------------
4. SOURCE OF FUNDS
Not Applicable
--------------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) OR 2(e) |_|
--------------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION
USA
--------------------------------------------------------------------------------
7. SOLE VOTING POWER
-0-
------------------------------------------------------
Number Of Shares 8. SHARED VOTING POWER
Beneficially Owned By 9,843,900 (1)
Each Reporting Person ------------------------------------------------------
With 9. SOLE DISPOSITIVE POWER
-0-
------------------------------------------------------
10. SHARED DISPOSITIVE POWER
9,843,900 (1)
--------------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9,843,900
--------------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
SHARES |_|
--------------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
15.1%
--------------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON
IN
--------------------------------------------------------------------------------

(1) Of these shares, 9,828,700 shares may be deemed to be beneficially owned by
Mr. Patterson solely in his capacity as one of the three controlling persons of
SPO Advisory Corp. and 15,200 shares may be deemed to be beneficially owned by
Mr. Patterson solely in his capacity as a controlling person, director and
executive officer of the Elizabeth R. & William J. Patterson Foundation.

Page 12 of 43 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
The Elizabeth R. & William J. Patterson Foundation
--------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_|
(b) |X|
--------------------------------------------------------------------------------
3. SEC Use Only
--------------------------------------------------------------------------------
4. SOURCE OF FUNDS
WC
--------------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) OR 2(e) |_|
--------------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION
CALIFORNIA
--------------------------------------------------------------------------------
7. SOLE VOTING POWER
15,200 (1)
------------------------------------------------------
Number Of Shares 8. SHARED VOTING POWER
Beneficially Owned By 0
Each Reporting Person ------------------------------------------------------
With 9. SOLE DISPOSITIVE POWER
15,200 (1)
------------------------------------------------------
10. SHARED DISPOSITIVE POWER
0
--------------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
15,200
--------------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
SHARES |_|
--------------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
**0.1%
--------------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON
CO
--------------------------------------------------------------------------------

** Denotes less than.

(1) Power is exercised through its controlling persons, directors and executive
officers, William J. Patterson and Elizabeth R. Patterson.

Page 13 of 43 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
Ian R. McGuire
--------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_|
(b) |X|
--------------------------------------------------------------------------------
3. SEC Use Only
--------------------------------------------------------------------------------
4. SOURCE OF FUNDS
PF
--------------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) OR 2(e) |_|
--------------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION
CALIFORNIA
--------------------------------------------------------------------------------
7. SOLE VOTING POWER
475
------------------------------------------------------
Number Of Shares 8. SHARED VOTING POWER
Beneficially Owned By 0
Each Reporting Person ------------------------------------------------------
With 9. SOLE DISPOSITIVE POWER
475
------------------------------------------------------
10. SHARED DISPOSITIVE POWER
0
--------------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
475
--------------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
SHARES |_|
--------------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
**0.1%
--------------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON
IN
--------------------------------------------------------------------------------

** Denotes less than.

Page 14 of 43 pages
CUSIP No. 127055101

--------------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
Betty Jane Weimer
--------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_|
(b) |X|
--------------------------------------------------------------------------------
3. SEC Use Only
--------------------------------------------------------------------------------
4. SOURCE OF FUNDS
PF
--------------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) OR 2(e) |_|
--------------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION
California
--------------------------------------------------------------------------------
7. SOLE VOTING POWER
5,000
------------------------------------------------------
Number Of Shares 8. SHARED VOTING POWER
Beneficially Owned By -0-
Each Reporting Person ------------------------------------------------------
With 9. SOLE DISPOSITIVE POWER
5,000
------------------------------------------------------
10. SHARED DISPOSITIVE POWER
-0-
--------------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,000
--------------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
SHARES |_|
--------------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
**0.1%
--------------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON
IN
--------------------------------------------------------------------------------

** Denotes less than.

Page 15 of 43 pages

This Amendment No. 8 amends the Schedule 13D (the "Original 13D") filed
with the Securities and Exchange Commission ("SEC") on August 29, 2005 and as
amended on September 14, 2005, September 26, 2005, October 20, 2005, November 8,
2005, January 12, 2006, June 20, 2006, and December 18, 2007. Unless otherwise
stated herein, the Original 13D, as previously amended, remains in full force
and effect. Terms used herein and not defined herein shall have the meanings
ascribed thereto in the Original 13D.

ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

Item 3 is hereby amended and restated in its entirety as follows:

The source and amount of the funds used or to be used by the Reporting
Persons to purchase Shares are as follows:

NAME SOURCE OF FUNDS AMOUNT OF FUNDS
--------------------- --------------------------- ---------------
SPO Contributions from Partners $303,604,172
SPO Advisory Partners Not Applicable Not Applicable
SFP Contributions from Partners $ 13,433,286
SF Advisory Partners Not Applicable Not Applicable
SPO Advisory Corp. Not Applicable Not Applicable
JHS Not Applicable Not Applicable
WEO Not Applicable and
Personal Funds (1) $ 5,378,674
WJP Not Applicable Not Applicable
Oberndorf Trust Personal Funds (1) $ 12,237,424
OFP Contribution from Partners $ 3,635,448
Patterson Foundation Contributions from Shareholders $506,555
IRM Personal Funds (1) $16,877
BJW Personal Funds (1) $ 186,594

----------
(1) As used herein, the term "Personal Funds" includes sums borrowed from banks
and brokerage firm margin accounts, none of which were borrowed or otherwise
obtained for the specified purpose of acquiring, holding, trading or voting
Shares.

ITEM 5. INTEREST IN SECURITIES OF THE ISSUER.

Item 5 is hereby amended and restated in its entirety as follows:

(a) Percentage interest calculations for each Reporting Person are
based upon the Issuer having 65,294,938 total outstanding shares of Common Stock
as reported on the Issuer's 10-K filed with the Securities and Exchange
Commission on November 29, 2007.

SPO

The aggregate number of Shares that SPO owns beneficially, pursuant to
Rule 13d-3 of the Act, is 9,413,100 Shares, which constitutes approximately
14.4% of the outstanding Shares.

SPO Advisory Partners

Because of its position as the sole general partner of SPO, SPO
Advisory Partners may, pursuant to Rule 13d-3 of the Act, be deemed to be the
beneficial owner of 9,413,100 Shares, which constitutes approximately 14.4% of
the outstanding Shares.

Page 16 of 43 pages

SFP

The aggregate number of Shares that SFP owns beneficially, pursuant to
Rule 13d-3 of the Act, is 415,600 Shares, which constitutes approximately 0.6%
of the outstanding Shares.

SF Advisory Partners

Because of its position as the sole general partner of SFP, SF Advisory
Partners may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial
owner of 415,600 Shares, which constitutes approximately 0.6% of the outstanding
Shares.

SPO Advisory Corp.

Because of its positions as the sole general partner of each of SPO
Advisory Partners and SF Advisory Partners, SPO Advisory Corp. may, pursuant to
Rule 13d-3 of the Act, be deemed to be the beneficial owner of 9,828,700 Shares
in the aggregate, which constitutes approximately 15.1% of the outstanding
Shares.

JHS

Because of his position as a control person of SPO Advisory Corp., JHS
may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of
9,828,700 Shares, which constitutes approximately 15.1% of the outstanding
Shares.

WEO

Individually, and because of his positions as a control person of SPO
Advisory Corp., a trustee of the Oberndorf Trust and sole general partner of OFP
and as trustee for the account of his children, WEO may, pursuant to Rule 13d-3
of the Act, be deemed to be the beneficial owner of 10,381,350 Shares in the
aggregate, which constitutes approximately 15.9% of the outstanding Shares.

WJP

Because of his position as a control person of SPO Advisory Corp. and
as a control person, director and executive officer of Patterson Foundation, WJP
may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of
9,843,900 Shares, which constitutes approximately 15.1% of the outstanding
Shares.

Oberndorf Trust

The aggregate number of Shares that the Oberndorf Trust owns
beneficially, pursuant to Rule 13d-3 of the Act, is 333,650 Shares, which
constitutes approximately 0.6% of the outstanding Shares.

OFP

The aggregate number of Shares that OFP owns beneficially, pursuant to
Rule 13d-3 of the Act, is 100,000 Shares, which constitutes approximately 0.2%
of the outstanding Shares.

Patterson Foundation

The aggregate number of Shares that Patterson Foundation owns
beneficially, pursuant to Rule 13d-3 of the Act, is 15,200, which constitutes
less than 0.1% of the outstanding Shares.

IRM

The aggregate number of Shares that IRM owns beneficially, pursuant to
Rule 13d-3 of the Act, is 475 Shares, which constitutes less than 0.1% of the
outstanding Shares.

BJW

The aggregate number of Shares that BJW owns beneficially, pursuant to
Rule 13d-3 of the Act, is 5,000 Shares, which constitutes less than 0.1% of the
outstanding Shares.

Page 17 of 43 pages

To the best of the knowledge of each of the Reporting Persons, other
than as set forth above, none of the persons named in Item 2 hereof is the
beneficial owner of any Shares.

(b) SPO

Acting through its sole general partner, SPO has the sole power to vote
or to direct the vote and to dispose or to direct the disposition of 9,413,100
Shares.

SPO Advisory Partners

Acting through its sole general partner and in its capacity as the sole
general partner of SPO, SPO Advisory Partners has the sole power to vote or to
direct the vote and to dispose or to direct the disposition of 9,413,100
Shares.

SFP

Acting through its sole general partner, SFP has the sole power to vote
or to direct the vote and to dispose or to direct the disposition of 415,600
Shares.

SF Advisory Partners

Acting through its sole general partner and in its capacity as the sole
general partner of SFP, SF Advisory Partners has the sole power to vote or to
direct the vote and to dispose or to direct the disposition of 415,600 Shares.

SPO Advisory Corp.

Acting through its controlling persons and in its capacities as the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
SPO Advisory Corp. has the sole power to vote or to direct the vote and to
dispose or to direct the disposition of 9,828,700 Shares in the aggregate.

JHS

As one of three controlling persons of SPO Advisory Corp., which is the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
JHS may be deemed to have shared power with WEO and WJP to vote or to direct the
vote and to dispose or to direct the disposition of 9,828,700 Shares held by
SPO and SFP in the aggregate.

WEO

As one of three controlling persons of SPO Advisory Corp., which is the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
WEO may be deemed to have shared power with JHS and WJP to vote or to direct the
vote and to dispose or to direct the disposition of 9,828,700 Shares held by SPO
and SFP in the aggregate. WEO may be deemed to have shared power to vote or to
direct the vote and to dispose or to direct the disposition of 333,650 Shares
held in the Oberndorf Trust. Individually, and because of his position as the
sole general partner of OFP, WEO has the sole power to vote or to direct the
vote and to dispose or to direct the disposition of 109,000 Shares held in WEO's
Individual Retirement Account, which is self directed, and 100,000 Shares held
by OFP. Solely in his capacity as trustee for the account of his children, WEO
has the sole power to vote or to direct the vote and to dispose or to direct the
disposition of 10,000 shares owned by his children.

WJP

As one of three controlling persons of SPO Advisory Corp., which is the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
WJP may be deemed to have shared power with JHS and WEO to vote or to direct the
vote and to dispose or to direct the disposition of 9,828,700 Shares held by
SPO and SFP in the aggregate. WJP may be deemed to have shared power to vote or
to direct the vote and to dispose or to direct the disposition of 15,200 Shares
held by the Patterson Foundation.

Page 18 of 43 pages

Oberndorf Trust

Acting through its trustees, Oberndorf Trust has the sole power to vote
or to direct the vote and to dispose or to direct the disposition of 333,650
Shares in the aggregate.

OFP

OFP has the sole power to vote or to direct the vote and to dispose or
to direct the disposition of 100,000 Shares.

Patterson Foundation

Acting through its two controlling persons, directors and executive
officers, Patterson Foundation has the sole power to vote or to direct the vote
and to dispose or to direct the disposition of 15,200 Shares.

IRM

IRM has the sole power to vote or to direct the vote and to dispose or
to direct the disposition of 475 Shares.

BJW

BJW has the sole power to vote or to direct the vote and to dispose or
to direct the disposition of 5,000 Shares.

(c) Since the most recent filing on Schedule 13D, the Reporting Persons
purchased Shares in open market transactions as set forth on Schedule I attached
hereto.

Except as set forth in this paragraph (c), to the best of the knowledge
of each of the Reporting Persons, none of the persons named in response to
paragraph (a) has effected any transactions in Shares since the most recent
filing on Schedule 13D.

(d) Each of the Reporting Persons affirms that no person other than
such Reporting Person has the right to receive or the power to direct the
receipt of distributions with respect to, or the proceeds from the sale of,
Shares owned by such Reporting Person.

(e) Not applicable.

ITEM 7. MATERIAL TO BE FILED AS EXHIBITS.

Item 7 is hereby amended and restated in its entirety as follows:

Exhibit A: Agreement pursuant to Rule 13d-1(k)

Page 19 of 43 pages

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

Dated January 4, 2008 By: /s/ Kim M. Silva
--------------------------------
Kim M. Silva

Attorney-in-Fact for:

SPO PARTNERS II, L.P.(1)
SPO ADVISORY PARTNERS, L.P.(1)
SAN FRANCISCO PARTNERS II, L.P.(1)
SF ADVISORY PARTNERS, L.P.(1)
SPO ADVISORY CORP.(1)
JOHN H. SCULLY(1)
WILLIAM E. OBERNDORF(1)
WILLIAM J. PATTERSON(1)
WILLIAM AND SUSAN OBERNDORF TRUST,
DATED 10/19/98 (1)
OBERNDORF FAMILY PARTNERS (1)
THE ELIZABETH R. & WILLIAM J.
PATTERSON FOUNDATION (1)
IAN R. MCGUIRE (1)
BETTY JANE WEIMER (1)

(1) A Power of Attorney
authorizing Kim M. Silva to
act on behalf of this
person or entity has been previously
filed with the Securities and
Exchange Commission.

Page 20 of 43 pages

SCHEDULE I TO SCHEDULE 13D

NUMBER
DATE OF OF PRICE PER WHERE/HOW TRANSACTION
REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED
------------------------------------------ ----------- ---- ------ --------- ---------------------

SPO Partners II, L.P. 12/17/2007 Buy 98 32.28 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 195 32.29 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 391 32.30 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 880 32.31 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 684 32.32 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 293 32.33 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 1,271 32.34 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 684 32.35 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 195 32.36 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 195 32.37 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 391 32.38 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 684 32.39 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 391 32.40 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 391 32.41 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 293 32.42 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 586 32.43 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 684 32.44 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 391 32.45 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 1,173 32.46 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 586 32.47 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 684 32.48 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 782 32.49 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 684 32.50 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 293 32.51 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 391 32.52 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 684 32.53 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 489 32.54 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 586 32.55 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 782 32.56 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 880 32.57 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 489 32.58 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 195 32.59 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 293 32.60 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 98 32.62 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 782 32.63 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 98 32.64 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 2,932 32.65 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 195 32.66 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 98 32.67 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 782 32.68 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 195 32.69 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 880 32.70 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 489 32.71 Open Market/Broker

Page 21 of 43 pages

SCHEDULE I TO SCHEDULE 13D

SPO Partners II, L.P. 12/17/2007 Buy 489 32.72 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 391 32.73 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 1,564 32.74 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 2,639 32.75 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 1,466 32.76 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 2,444 32.77 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 1,466 32.78 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 880 32.79 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 1,857 32.80 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 1,564 32.81 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 1,564 32.82 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 2,053 32.83 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 586 32.84 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 586 32.85 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 977 32.86 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 684 32.87 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 1,173 32.88 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 1,173 32.89 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 195 32.90 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 98 32.91 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 880 32.92 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 293 32.93 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 195 32.94 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 586 32.95 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 293 32.96 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 977 32.97 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 1,075 32.98 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 1,662 32.99 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 977 33.00 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 880 33.01 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 391 33.02 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 98 33.03 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 195 33.04 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 293 33.05 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 195 33.06 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 586 33.07 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 293 33.08 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 293 33.09 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 391 33.11 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 489 33.12 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 98 33.13 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 98 33.14 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 293 33.15 Open Market/Broker

Page 22 of 43 pages

SCHEDULE I TO SCHEDULE 13D

SPO Partners II, L.P. 12/17/2007 Buy 98 33.16 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 98 33.17 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 195 33.18 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 293 33.19 Open Market/Broker
SPO Partners II, L.P. 12/17/2007 Buy 499 33.20 Open Market/Broker
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 32.28 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.29 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 32.30 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 20 32.31 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.32 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 32.33 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 29 32.34 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.35 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.36 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.37 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 32.38 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.39 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 32.40 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 32.41 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 32.42 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 14 32.43 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.44 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 32.45 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 27 32.46 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 14 32.47 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.48 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 18 32.49 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.50 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 32.51 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 32.52 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.53 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 11 32.54 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 14 32.55 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 18 32.56 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 20 32.57 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 11 32.58 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.59 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 32.60 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 32.62 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 18 32.63 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 32.64 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 68 32.65 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.66 Open Market/Broker
Foundation

Page 23 of 43 pages

SCHEDULE I TO SCHEDULE 13D

The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 32.67 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 18 32.68 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.69 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 20 32.70 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 11 32.71 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 11 32.72 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 32.73 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 36 32.74 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 61 32.75 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 34 32.76 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 56 32.77 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 34 32.78 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 20 32.79 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 43 32.80 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 36 32.81 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 36 32.82 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 47 32.83 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 14 32.84 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 14 32.85 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 23 32.86 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.87 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 27 32.88 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 27 32.89 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.90 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 32.91 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 20 32.92 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 32.93 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.94 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 14 32.95 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 32.96 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 23 32.97 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 25 32.98 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 38 32.99 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 23 33.00 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 20 33.01 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 33.02 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 33.03 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 33.04 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 33.05 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 33.06 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 14 33.07 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 33.08 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 33.09 Open Market/Broker
Foundation

Page 24 of 43 pages

SCHEDULE I TO SCHEDULE 13D

The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 33.11 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 11 33.12 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 33.13 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 33.14 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 33.15 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 33.16 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 33.17 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 33.18 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 33.19 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/17/2007 Buy 1 33.20 Open Market/Broker
Foundation

SPO Partners II, L.P. 12/18/2007 Buy 98 32.62 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 293 32.64 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 196 32.65 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 489 32.66 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 391 32.67 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 685 32.68 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 978 32.69 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 98 32.70 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 196 32.71 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 196 32.73 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 293 32.74 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 587 32.77 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 489 32.79 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 293 32.80 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 293 32.81 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 978 32.82 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 391 32.83 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 587 32.84 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 391 32.85 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 489 32.86 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 196 32.87 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 489 32.88 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 8,413 32.89 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 783 32.90 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 1,174 32.91 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 1,174 32.92 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 1,565 32.93 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 1,467 32.94 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 1,076 32.95 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 1,565 32.96 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 2,641 32.97 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 1,565 32.98 Open Market/Broker

Page 25 of 43 pages

SCHEDULE I TO SCHEDULE 13D

SPO Partners II, L.P. 12/18/2007 Buy 293 32.99 Open Market/Broker
SPO Partners II, L.P. 12/18/2007 Buy 688 33.00 Open Market/Broker
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 2 32.62 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 7 32.64 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 4 32.65 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 11 32.66 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 9 32.67 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 15 32.68 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 22 32.69 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 2 32.70 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 4 32.71 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 4 32.73 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 7 32.74 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 13 32.77 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 11 32.79 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 7 32.80 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 7 32.81 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 22 32.82 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 9 32.83 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 13 32.84 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 9 32.85 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 11 32.86 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 4 32.87 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 11 32.88 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 187 32.89 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 17 32.90 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 26 32.91 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 26 32.92 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 35 32.93 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 33 32.94 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 24 32.95 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 35 32.96 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 59 32.97 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 35 32.98 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 7 32.99 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/18/2007 Buy 12 33.00 Open Market/Broker
Foundation

SPO Partners II, L.P. 12/19/2007 Buy 195 33.06 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 195 33.07 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 391 33.08 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 488 33.09 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 44,664 33.10 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 98 33.11 Open Market/Broker

Page 26 of 43 pages

SCHEDULE I TO SCHEDULE 13D

SPO Partners II, L.P. 12/19/2007 Buy 835 33.12 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 879 33.13 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,172 33.14 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,269 33.15 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 488 33.16 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 293 33.17 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 488 33.18 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 781 33.19 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,367 33.20 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 488 33.21 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 683 33.22 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 683 33.23 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,757 33.24 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 391 33.25 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 976 33.26 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 683 33.27 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,367 33.28 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,269 33.29 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,562 33.30 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,367 33.31 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,367 33.32 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 683 33.33 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,465 33.34 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,269 33.35 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,465 33.36 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,562 33.37 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,660 33.38 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,953 33.39 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,074 33.40 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 586 33.41 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,074 33.42 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 586 33.44 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 195 33.45 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 586 33.46 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 1,074 33.47 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 195 33.48 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 586 33.49 Open Market/Broker
SPO Partners II, L.P. 12/19/2007 Buy 391 33.50 Open Market/Broker
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 5 33.06 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 5 33.07 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 9 33.08 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 12 33.09 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 1,081 33.10 Open Market/Broker
Foundation

Page 27 of 43 pages

SCHEDULE I TO SCHEDULE 13D

The Elizabeth R. and William J. Patterson 12/19/2007 Buy 2 33.11 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 20 33.12 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 21 33.13 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 28 33.14 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 31 33.15 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 12 33.16 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 7 33.17 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 12 33.18 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 19 33.19 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 33 33.20 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 12 33.21 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 17 33.22 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 17 33.23 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 43 33.24 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 9 33.25 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 24 33.26 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 17 33.27 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 33 33.28 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 31 33.29 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 38 33.30 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 33 33.31 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 33 33.32 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 17 33.33 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 35 33.34 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 31 33.35 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 35 33.36 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 38 33.37 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 40 33.38 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 47 33.39 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 26 33.40 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 14 33.41 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 26 33.42 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 14 33.44 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 5 33.45 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 14 33.46 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 26 33.47 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 5 33.48 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 14 33.49 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/19/2007 Buy 9 33.50 Open Market/Broker
Foundation

SPO Partners II, L.P. 12/20/2007 Buy 397 32.83 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 298 32.84 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 199 32.85 Open Market/Broker

Page 28 of 43 pages

SCHEDULE I TO SCHEDULE 13D

SPO Partners II, L.P. 12/20/2007 Buy 298 32.86 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 596 32.88 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 99 32.89 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 99 32.90 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 199 32.91 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 497 32.92 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 99 32.93 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 397 32.94 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 298 32.95 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 4,271 32.96 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 894 32.97 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 3,139 32.98 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 3,293 32.99 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 3,575 33.00 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,092 33.01 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,390 33.02 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 397 33.03 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,092 33.04 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,291 33.05 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,490 33.06 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,887 33.07 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,788 33.08 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 2,682 33.09 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 26,319 33.10 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,413 33.11 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,986 33.12 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,092 33.13 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,986 33.14 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 2,483 33.15 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,788 33.16 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,788 33.17 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,688 33.18 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,092 33.19 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,490 33.20 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 795 33.21 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,092 33.22 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 596 33.23 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,291 33.24 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,092 33.25 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 894 33.26 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 199 33.27 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 1,291 33.28 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 993 33.29 Open Market/Broker

Page 29 of 43 pages

SCHEDULE I TO SCHEDULE 13D

SPO Partners II, L.P. 12/20/2007 Buy 1,092 33.30 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 795 33.31 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 99 33.32 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 99 33.33 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 99 33.34 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 199 33.35 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 99 33.36 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 799 33.37 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 397 33.38 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 298 33.39 Open Market/Broker
SPO Partners II, L.P. 12/20/2007 Buy 99 33.40 Open Market/Broker
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 3 32.83 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 2 32.84 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 32.85 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 2 32.86 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 4 32.88 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 32.89 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 32.90 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 32.91 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 3 32.92 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 32.93 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 3 32.94 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 2 32.95 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 29 32.96 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 6 32.97 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 22 32.98 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 23 32.99 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 25 33.00 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 8 33.01 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 10 33.02 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 3 33.03 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 8 33.04 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 9 33.05 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 10 33.06 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 13 33.07 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 12 33.08 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 18 33.09 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 181 33.10 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 10 33.11 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 14 33.12 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 8 33.13 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 14 33.14 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 17 33.15 Open Market/Broker
Foundation

Page 30 of 43 pages

SCHEDULE I TO SCHEDULE 13D

The Elizabeth R. and William J. Patterson 12/20/2007 Buy 12 33.16 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 12 33.17 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 12 33.18 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 8 33.19 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 10 33.20 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 5 33.21 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 8 33.22 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 4 33.23 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 9 33.24 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 8 33.25 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 6 33.26 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.27 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 9 33.28 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 7 33.29 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 8 33.30 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 5 33.31 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.32 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.33 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.34 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.35 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.36 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.37 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 3 33.38 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 2 33.39 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.40 Open Market/Broker
Foundation

SPO Partners II, L.P. 12/21/2007 Buy 400 33.27 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 400 33.28 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 2,700 33.29 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 1,600 33.30 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 2,200 33.31 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 3,000 33.32 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 2,200 33.33 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 1,800 33.34 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 1,700 33.35 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 700 33.36 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 600 33.37 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 1,200 33.38 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 600 33.39 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 600 33.40 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 600 33.41 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 300 33.42 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 100 33.43 Open Market/Broker

Page 31 of 43 pages

SCHEDULE I TO SCHEDULE 13D

SPO Partners II, L.P. 12/21/2007 Buy 200 33.45 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 400 33.46 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 500 33.47 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 300 33.48 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 500 33.49 Open Market/Broker
SPO Partners II, L.P. 12/21/2007 Buy 2,400 33.50 Open Market/Broker

SPO Partners II, L.P. 12/24/2007 Buy 195 33.06 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 98 33.07 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 195 33.08 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 98 33.09 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 195 33.10 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 390 33.11 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 293 33.12 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 98 33.14 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 98 33.15 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 293 33.17 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 488 33.18 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 195 33.19 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 195 33.20 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 293 33.21 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 98 33.22 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 195 33.23 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 98 33.24 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 390 33.25 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 390 33.26 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 293 33.27 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 390 33.28 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 390 33.29 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 488 33.30 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 293 33.31 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 195 33.32 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 195 33.33 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 195 33.35 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 293 33.36 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 195 33.37 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 488 33.38 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 390 33.39 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 781 33.40 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 1,464 33.41 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 683 33.42 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 878 33.43 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 878 33.44 Open Market/Broker

Page 32 of 43 pages

SCHEDULE I TO SCHEDULE 13D

SPO Partners II, L.P. 12/24/2007 Buy 1,756 33.45 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 1,366 33.46 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 585 33.47 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 781 33.48 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 488 33.49 Open Market/Broker
SPO Partners II, L.P. 12/24/2007 Buy 2,340 33.50 Open Market/Broker
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.06 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 2 33.07 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.08 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 2 33.09 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.10 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 10 33.11 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 7 33.12 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 2 33.14 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 2 33.15 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 7 33.17 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 12 33.18 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.19 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.20 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 7 33.21 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 2 33.22 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.23 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 2 33.24 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 10 33.25 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 10 33.26 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 7 33.27 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 10 33.28 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 10 33.29 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 12 33.30 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 7 33.31 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.32 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.33 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.35 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 7 33.36 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.37 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 12 33.38 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 10 33.39 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 19 33.40 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 36 33.41 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 17 33.42 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 22 33.43 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 22 33.44 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 44 33.45 Open Market/Broker
Foundation

Page 33 of 43 pages

SCHEDULE I TO SCHEDULE 13D

The Elizabeth R. and William J. Patterson 12/24/2007 Buy 34 33.46 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 15 33.47 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 19 33.48 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 12 33.49 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/24/2007 Buy 60 33.50 Open Market/Broker
Foundation

SPO Partners II, L.P. 12/26/2007 Buy 97 33.45 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 97 33.46 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 195 33.47 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 97 33.48 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 97 33.49 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 390 33.50 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 487 33.57 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 2,924 33.58 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 1,072 33.59 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 487 33.60 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 975 33.61 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 780 33.62 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 585 33.63 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 1,364 33.64 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 585 33.65 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 585 33.66 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 390 33.67 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 97 33.68 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 97 33.69 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 487 33.70 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 195 33.71 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 390 33.72 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 390 33.73 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 877 33.74 Open Market/Broker
SPO Partners II, L.P. 12/26/2007 Buy 1,560 33.75 Open Market/Broker
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 3 33.45 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 3 33.46 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 5 33.47 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 3 33.48 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 3 33.49 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 10 33.50 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 13 33.57 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 76 33.58 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 28 33.59 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 13 33.60 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 25 33.61 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 20 33.62 Open Market/Broker
Foundation

Page 34 of 43 pages

SCHEDULE I TO SCHEDULE 13D

The Elizabeth R. and William J. Patterson 12/26/2007 Buy 15 33.63 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 36 33.64 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 15 33.65 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 15 33.66 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 10 33.67 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 3 33.68 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 3 33.69 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 13 33.70 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 5 33.71 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 10 33.72 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 10 33.73 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 23 33.74 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/26/2007 Buy 40 33.75 Open Market/Broker
Foundation

SPO Partners II, L.P. 12/27/2007 Buy 195 33.13 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 195 33.14 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 390 33.15 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 293 33.17 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 195 33.18 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 683 33.19 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 683 33.20 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 683 33.21 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 1,073 33.22 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 1,268 33.23 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 683 33.24 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 1,171 33.25 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 1,561 33.26 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 1,171 33.27 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 293 33.28 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 976 33.29 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 1,268 33.30 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 1,171 33.31 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 683 33.32 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 1,171 33.33 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 976 33.34 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 878 33.35 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 1,463 33.36 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 488 33.37 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 1,463 33.38 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 1,463 33.39 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 1,659 33.40 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 683 33.41 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 683 33.42 Open Market/Broker

Page 35 of 43 pages

SCHEDULE I TO SCHEDULE 13D

SPO Partners II, L.P. 12/27/2007 Buy 1,073 33.43 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 781 33.44 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 1,268 33.45 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 4,390 33.46 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 5,073 33.47 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 3,707 33.48 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 4,195 33.49 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 6,049 33.50 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 1,268 33.51 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 976 33.52 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 585 33.53 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 488 33.54 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 195 33.55 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 195 33.56 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 195 33.58 Open Market/Broker
SPO Partners II, L.P. 12/27/2007 Buy 100 33.59 Open Market/Broker
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 5 33.13 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 5 33.14 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 10 33.15 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 7 33.17 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 5 33.18 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 17 33.19 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 17 33.20 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 17 33.21 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 27 33.22 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 32 33.23 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 17 33.24 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 29 33.25 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 39 33.26 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 29 33.27 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 7 33.28 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 24 33.29 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 32 33.30 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 29 33.31 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 17 33.32 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 29 33.33 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 24 33.34 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 22 33.35 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 37 33.36 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 12 33.37 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 37 33.38 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 37 33.39 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 41 33.40 Open Market/Broker
Foundation

Page 36 of 43 pages

SCHEDULE I TO SCHEDULE 13D

The Elizabeth R. and William J. Patterson 12/27/2007 Buy 17 33.41 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 17 33.42 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 27 33.43 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 19 33.44 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 32 33.45 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 110 33.46 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 127 33.47 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 93 33.48 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 105 33.49 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 151 33.50 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 32 33.51 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 24 33.52 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 15 33.53 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 12 33.54 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 5 33.55 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 5 33.56 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy 5 33.58 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/27/2007 Buy - 33.59 Open Market/Broker
Foundation

SPO Partners II, L.P. 12/28/2007 Buy 293 33.21 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 195 33.22 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 293 33.23 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 781 33.24 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 391 33.25 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 683 33.26 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 683 33.27 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 1,172 33.28 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 2,384 33.29 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 5,468 33.30 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 1,660 33.31 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 1,269 33.32 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 683 33.33 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 488 33.34 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 1,172 33.35 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 586 33.36 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 976 33.37 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 683 33.38 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 195 33.39 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 586 33.40 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 195 33.41 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 683 33.42 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 391 33.43 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 195 33.44 Open Market/Broker

Page 37 of 43 pages

SCHEDULE I TO SCHEDULE 13D

SPO Partners II, L.P. 12/28/2007 Buy 976 33.45 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 391 33.46 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 488 33.48 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 391 33.49 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 586 33.50 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 98 33.58 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 683 33.59 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 879 33.60 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 293 33.61 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 391 33.62 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 488 33.63 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 488 33.64 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 683 33.65 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 391 33.66 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 488 33.67 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 586 33.68 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 391 33.69 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 195 33.70 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 683 33.71 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 1,074 33.72 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 683 33.73 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 1,269 33.74 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 2,343 33.75 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 293 33.77 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 98 33.78 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 98 33.80 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 195 33.81 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 195 33.82 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 293 33.83 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 293 33.84 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 683 33.85 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 1,660 33.86 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 1,269 33.87 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 879 33.88 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 1,269 33.89 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 1,172 33.90 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 976 33.91 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 2,831 33.92 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 1,953 33.93 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 2,986 33.94 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 3,222 33.95 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 2,831 33.96 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 2,831 33.97 Open Market/Broker

Page 38 of 43 pages

SCHEDULE I TO SCHEDULE 13D

SPO Partners II, L.P. 12/28/2007 Buy 5,077 33.98 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 1,953 33.99 Open Market/Broker
SPO Partners II, L.P. 12/28/2007 Buy 100 34.00 Open Market/Broker
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 7 33.21 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 5 33.22 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 7 33.23 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 19 33.24 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 9 33.25 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.26 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.27 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 28 33.28 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 58 33.29 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 132 33.30 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 40 33.31 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 31 33.32 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.33 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 12 33.34 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 28 33.35 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 14 33.36 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 24 33.37 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.38 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 5 33.39 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 14 33.40 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 5 33.41 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.42 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 9 33.43 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 5 33.44 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 24 33.45 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 9 33.46 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 12 33.48 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 9 33.49 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 14 33.50 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 2 33.58 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.59 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 21 33.60 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 7 33.61 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 9 33.62 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 12 33.63 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 12 33.64 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.65 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 9 33.66 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 12 33.67 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 14 33.68 Open Market/Broker
Foundation

Page 39 of 43 pages

SCHEDULE I TO SCHEDULE 13D

The Elizabeth R. and William J. Patterson 12/28/2007 Buy 9 33.69 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 5 33.70 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.71 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 26 33.72 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.73 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 31 33.74 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 57 33.75 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 7 33.77 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 2 33.78 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 2 33.80 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 5 33.81 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 5 33.82 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 7 33.83 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 7 33.84 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.85 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 40 33.86 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 31 33.87 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 21 33.88 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 31 33.89 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 28 33.90 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 24 33.91 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 69 33.92 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 47 33.93 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 72 33.94 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 78 33.95 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 69 33.96 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 69 33.97 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 123 33.98 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy 47 33.99 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/28/2007 Buy - 34.00 Open Market/Broker
Foundation

SPO Partners II, L.P. 12/31/2007 Buy 198 33.31 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 198 33.32 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 99 33.33 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 198 33.35 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 297 33.36 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 99 33.37 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 495 33.38 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 1,584 33.40 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 1,980 33.41 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 1,386 33.42 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 5,346 33.43 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 6,633 33.44 Open Market/Broker

Page 40 of 43 pages

SCHEDULE I TO SCHEDULE 13D

SPO Partners II, L.P. 12/31/2007 Buy 4,950 33.45 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 6,336 33.45 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 8,217 33.46 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 8,910 33.47 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 3,168 33.48 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 3,366 33.49 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 3,168 33.50 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 1,584 33.51 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 1,683 33.52 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 1,386 33.53 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 594 33.54 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 1,584 33.56 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 1,386 33.57 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 1,386 33.58 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 3,267 33.59 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 3,168 33.60 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 1,089 33.61 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 10,494 33.61 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 1,386 33.62 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 5,148 33.63 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 594 33.64 Open Market/Broker
SPO Partners II, L.P. 12/31/2007 Buy 7,623 33.65 Open Market/Broker
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 2 33.31 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 2 33.32 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 1 33.33 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 2 33.35 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 3 33.36 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 1 33.37 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 5 33.38 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 16 33.40 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 20 33.41 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 14 33.42 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 54 33.43 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 67 33.44 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 50 33.45 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 64 33.45 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 83 33.46 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 90 33.47 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 32 33.48 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 34 33.49 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 32 33.50 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 16 33.51 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 17 33.52 Open Market/Broker
Foundation

Page 41 of 43 pages

SCHEDULE I TO SCHEDULE 13D

The Elizabeth R. and William J. Patterson 12/31/2007 Buy 14 33.53 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 6 33.54 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 16 33.56 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 14 33.57 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 14 33.58 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 33 33.59 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 32 33.60 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 11 33.61 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 106 33.61 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 14 33.62 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 52 33.63 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 6 33.64 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 12/31/2007 Buy 77 33.65 Open Market/Broker
Foundation

SPO Partners II, L.P. 01/02/2008 Buy 3,604 32.68 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 195 32.69 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 97 32.70 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 2,630 32.73 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 1,169 32.75 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 195 32.76 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 487 32.80 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 97 32.81 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 2,012 32.82 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 812 32.83 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 779 32.84 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 195 32.85 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 195 32.86 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 682 32.87 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 877 32.88 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 97 32.89 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 4,684 32.90 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 19,577 32.91 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 10,958 32.92 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 158 32.93 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 2,873 32.94 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 1,864 32.95 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 3,370 32.96 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 9,743 32.97 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 6,136 32.98 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 3,207 32.99 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 20,627 33.00 Open Market/Broker
SPO Partners II, L.P. 01/02/2008 Buy 80 33.05 Open Market/Broker
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 96 32.68 Open Market/Broker
Foundation

Page 42 of 43 pages

SCHEDULE I TO SCHEDULE 13D

The Elizabeth R. and William J. Patterson 01/02/2008 Buy 5 32.69 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 3 32.70 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 70 32.73 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 31 32.75 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 5 32.76 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 13 32.80 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 3 32.81 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 54 32.82 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 22 32.83 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 21 32.84 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 5 32.85 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 5 32.86 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 18 32.87 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 23 32.88 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 3 32.89 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 125 32.90 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 523 32.91 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 292 32.92 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 4 32.93 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 77 32.94 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 50 32.95 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 90 32.96 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 260 32.97 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 164 32.98 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 86 32.99 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 551 33.00 Open Market/Broker
Foundation
The Elizabeth R. and William J. Patterson 01/02/2008 Buy 1 33.05 Open Market/Broker
Foundation

Page 43 of 43 pages

EXHIBIT INDEX

EXHIBIT DOCUMENT DESCRIPTION PAGE NO.
------- ------------------------------------ --------
A Agreement Pursuant to Rule 13d-1(k) 1