CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues
Oil, natural gas liquids and natural gas sales	$ 621,366	$ 763,261	$ 1,344,194
Gain (loss) on derivative instruments, net	(88,477)	115,293	335,019
Total revenues	532,889	878,554	1,679,213
Operating Costs and Expenses
Oil, natural gas liquids and natural gas production	171,714	228,380	274,432
Production and ad valorem taxes	42,938	57,380	102,063
Depreciation, depletion and amortization	447,961	593,789	548,564
Asset impairment	220,652	1,292,308	416,801
Exploration	5,415	14,878	28,090
General and administrative (including non-cash stock based compensation of $19,641, $12,910 and $16,262 for the years ended December 31, 2016, 2015 and 2014, respectively)	95,689	149,132	122,052
Accretion of discount on asset retirement obligations	6,672	7,108	7,608
(Gain) loss on sale of assets and other, net	(246,922)	(26,570)	2,642
Total operating costs and expenses	744,119	2,316,405	1,502,252
Operating Income (Loss)	(211,230)	(1,437,851)	176,961
Other Income (Expense)
Interest expense	(36,899)	(43,108)	(37,771)
Other income	978	223	1,181
Total other expense	(35,921)	(42,885)	(36,590)
Income (Loss) From Continuing Operations Before Income Taxes	(247,151)	(1,480,736)	140,371
Income tax expense (benefit)	(79,638)	(535,005)	40,728
Income (Loss) From Continuing Operations	(167,513)	(945,731)	99,643
Discontinued Operations, net of tax
Income from discontinued operations	0	0	29,292
Gain on disposal of discontinued operations, net	0	0	439,097
Income From Discontinued Operations	0	0	468,389
Net Income (Loss)	$ (167,513)	$ (945,731)	$ 568,032
Diluted Earnings Per Average Common Share
Continuing operations (in dollars per share)	$ (1.77)	$ (12.43)	$ 1.36
Discontinued operations (in dollars per share)	0.00	0.00	6.39
Net Income (Loss) (in dollars per share)	(1.77)	(12.43)	7.75
Basic Earnings Per Average Common Share
Continuing operations (in dollars per share)	(1.77)	(12.43)	1.37
Discontinued operations (in dollars per share)	0.00	0.00	6.42
Net Income (Loss) (in dollars per share)	$ (1.77)	$ (12.43)	$ 7.79
Diluted Average Common Shares Outstanding (in shares)	94,475,797	76,078,371	73,274,631
Basic Average Common Shares Outstanding (in shares)	94,475,797	76,078,371	72,896,579