Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues
Oil, natural gas liquids and natural gas sales	$ 188,398	$ 350,773	$ 595,510	$ 1,057,447
Gain on derivative instruments, net	107,173	147,735	90,245	9,498
Total revenues	295,571	498,508	685,755	1,066,945
Operating Costs and Expenses
Oil, natural gas liquids and natural gas production	54,598	67,720	175,933	199,861
Production and ad valorem taxes	13,366	25,729	45,783	81,102
Depreciation, depletion and amortization	149,781	139,104	434,005	399,568
Asset impairment	399,394	178,912	466,390	181,500
Exploration	493	8,417	12,274	21,218
General and administrative	23,631	27,784	94,338	93,499
Accretion of discount on asset retirement obligations	1,700	1,924	5,379	5,650
(Gain) loss on sale of assets and other	822	747	(26,046)	1,809
Total costs and expenses	643,785	450,337	1,208,056	984,207
Operating Income (Loss)	(348,214)	48,171	(522,301)	82,738
Other Income (Expense)
Interest expense	(10,084)	(11,522)	(33,086)	(27,374)
Other income	56	37	143	1,047
Total other expense	(10,028)	(11,485)	(32,943)	(26,327)
Income (Loss) From Continuing Operations Before Income Taxes	(358,242)	36,686	(555,244)	56,411
Income tax expense (benefit)	(130,338)	16,055	(200,319)	23,287
Income (Loss) From Continuing Operations	(227,904)	20,631	(354,925)	33,124
Discontinued Operations, net of tax
Income (loss) from discontinued operations	0	(3,485)	0	30,435
Gain on disposal of discontinued operations	0	440,105	0	439,055
Income From Discontinued Operations	0	436,620	0	469,490
Net Income (Loss)	$ (227,904)	$ 457,251	$ (354,925)	$ 502,614
Diluted Earnings Per Average Common Share
Continuing operations (in dollars per share)	$ (2.89)	$ 0.28	$ (4.72)	$ 0.45
Discontinued operations (in dollars per share)	0.00	5.94	0.00	6.41
Net Income (Loss) (in dollars per share)	(2.89)	6.22	(4.72)	6.86
Basic Earnings Per Average Common Share
Continuing operations (in dollars per share)	(2.89)	0.28	(4.72)	0.45
Discontinued operations (in dollars per share)	0.00	5.98	0.00	6.45
Net Income (Loss) (in dollars per share)	(2.89)	6.26	(4.72)	6.90
Dividends Per Common Share	$ 0.02	$ 0.15	$ 0.06	$ 0.45
Diluted Average Common Shares Outstanding (in shares)	78,742	73,507	75,125	73,238
Basic Average Common Shares Outstanding (in shares)	78,742	73,093	75,125	72,861