Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues
Oil, natural gas liquids and natural gas sales	$ 219,290	$ 355,852	$ 407,112	$ 706,674
Loss on derivative instruments, net	(50,964)	(84,846)	(16,928)	(138,237)
Total revenues	168,326	271,006	390,184	568,437
Operating Costs and Expenses
Oil, natural gas liquids and natural gas production	53,581	64,697	121,335	132,141
Production and ad valorem taxes	13,352	28,049	32,417	55,373
Depreciation, depletion and amortization	149,843	136,244	284,224	260,464
Asset impairment	60,413	1,342	66,996	2,588
Exploration	11,018	1,233	11,781	12,801
General and administrative	38,652	33,542	70,707	65,715
Accretion of discount on asset retirement obligations	1,669	1,883	3,679	3,726
(Gain) loss on sale of assets and other	1,476	909	(26,868)	1,062
Total costs and expenses	330,004	267,899	564,271	533,870
Operating Income (Loss)	(161,678)	3,107	(174,087)	34,567
Other Income (Expense)
Interest expense	(11,244)	(7,964)	(23,002)	(15,852)
Other income	41	687	87	1,010
Total other expense	(11,203)	(7,277)	(22,915)	(14,842)
Income (Loss) From Continuing Operations Before Income Taxes	(172,881)	(4,170)	(197,002)	19,725
Income tax expense (benefit)	(61,280)	(1,016)	(69,981)	7,232
Income (Loss) From Continuing Operations	(111,601)	(3,154)	(127,021)	12,493
Discontinued Operations, net of tax
Income (loss) from discontinued operations	0	(4,799)	0	33,920
Loss on disposal of discontinued operations	0	0	0	(1,050)
Income (Loss) From Discontinued Operations	0	(4,799)	0	32,870
Net Income (Loss)	$ (111,601)	$ (7,953)	$ (127,021)	$ 45,363
Diluted Earnings Per Average Common Share
Continuing operations (in dollars per share)	$ (1.52)	$ (0.04)	$ (1.74)	$ 0.17
Discontinued operations (in dollars per share)	0.00	(0.07)	0.00	0.45
Net Income (Loss) (in dollars per share)	(1.52)	(0.11)	(1.74)	0.62
Basic Earnings Per Average Common Share
Continuing operations (in dollars per share)	(1.52)	(0.04)	(1.74)	0.17
Discontinued operations (in dollars per share)	0.00	(0.07)	0.00	0.45
Net Income (Loss) (in dollars per share)	(1.52)	(0.11)	(1.74)	0.62
Dividends Per Common (In dollars per share)	$ 0.02	$ 0.15	$ 0.04	$ 0.30
Diluted Average Common Shares Outstanding (in shares)	73,452	72,851	73,143	73,031
Basic Average Common Shares Outstanding (in shares)	73,452	72,851	73,143	72,737