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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
Natural gas sales $ 122,623 $ 109,753 $ 165,461
Oil sales 53,083 142,669 389,770
Total oil and gas sales 175,706 252,422 555,231
Operating expenses:      
Production taxes 4,933 10,286 23,797
Gathering and transportation 15,824 14,298 12,897
Lease operating 47,696 64,502 60,283
Exploration 84,144 70,694 19,403
Depreciation, depletion and amortization 141,487 321,323 378,275
General and administrative, net 23,963 23,541 32,379
Impairment of oil and gas properties 27,134 801,347 60,268
Loss on sale of oil and gas properties 14,315 112,085  
Total operating expenses 359,496 1,418,076 587,302
Operating loss (183,790) (1,165,654) (32,071)
Other income (expenses):      
Gain (loss) from derivative financial instruments (5,356) 2,676 8,175
Net gain on extinguishment of debt 189,052 78,741  
Interest expense (128,743) (118,592) (58,631)
Other income 872 1,275 727
Total other income (expenses) 55,825 (35,900) (49,729)
Loss before income taxes (127,965) (1,201,554) (81,800)
Benefit from (provision for) income taxes (7,169) 154,445 24,689
Net loss $ (135,134) $ (1,047,109) $ (57,111)
Net loss per share – basic and diluted $ (11.52) $ (113.53) $ (6.20)
Dividends per common share     $ 2.50
Basic and diluted weighted average shares outstanding 11,729 9,223 9,309