CONSOLIDATED BALANCE SHEET (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 20,954	$ 23,400
Restricted cash	0	28,094
Accounts receivable, net	239,009	222,476
Inventories	14,026	17,468
Deferred income taxes	0	81,855
Derivative instruments	137,603	3,019
Other current assets	1,855	2,587
Total current assets	413,447	378,899
Properties and equipment, net (Successful efforts method)	4,925,711	4,546,227
Equity method investments	68,029	26,892
Other assets	30,529	29,062
TOTAL ASSETS	5,437,716	4,981,080
Current liabilities
Accounts payable	400,076	288,801
Accrued liabilities	63,669	73,601
Income taxes payable	0	31,591
Deferred income taxes	35,273	0
Derivative instruments	0	13,912
Total current liabilities	499,018	407,905
Postretirement benefits	35,827	33,554
Long-term debt	1,752,000	1,147,000
Deferred income taxes	843,876	1,067,912
Asset retirement obligations	124,655	73,853
Other liabilities	39,607	46,254
Total liabilities	3,294,983	2,776,478
Commitments and contingencies
Stockholders' equity
Common stock: Authorized -- 960,000,000 and 480,000,000 shares of $0.10 par value in 2014 and 2013, respectively Issued--422,915,258 and 422,014,681 shares in 2014 and 2013, respectively	42,292	42,201
Additional paid-in capital	710,432	710,940
Retained earnings	1,698,995	1,627,805
Accumulated other comprehensive income (loss)	(2,151)	(8,361)
Less treasury stock, at cost: 9,892,680 and 5,618,166 shares in 2014 and 2013, respectively	(306,835)	(167,983)
Total stockholders' equity	2,142,733	2,204,602
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 5,437,716	$ 4,981,080