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Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income (loss) $ 23,825 $ (64,455)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 126,666 122,449
Gain on extinguishment of debt 0 (7,016)
Impairment 2,682 3,562
Deferred income taxes 16,037 (27,629)
Derivative instruments (56,075) (14,375)
Stock-based compensation expenses 6,708 6,730
Deferred financing costs amortization and other 4,940 5,066
Working capital and other changes:    
Change in accounts receivable (22,478) (995)
Change in inventory (3,679) 349
Change in prepaid expenses 282 241
Change in other current assets (110) 4
Change in other assets (4) 77
Change in accounts payable, interest payable and accrued liabilities 6,060 (64,056)
Change in other current liabilities 2,945 (6,000)
Change in other liabilities 0 (3)
Net cash provided by (used in) operating activities 107,799 (46,051)
Cash flows from investing activities:    
Capital expenditures (96,047) (103,411)
Derivative settlements (7,960) 73,313
Advances from joint interest partners (759) (257)
Net cash used in investing activities (104,766) (30,355)
Cash flows from financing activities:    
Proceeds from revolving credit facility 246,000 214,000
Principal payments on revolving credit facility (241,000) (287,000)
Repurchase of senior unsecured notes 0 (22,308)
Deferred financing costs 0 (751)
Proceeds from sale of common stock 0 183,164
Purchases of treasury stock (5,419) (1,032)
Other (55) 0
Net cash provided by (used in) financing activities (474) 86,073
Increase in cash and cash equivalents 2,559 9,667
Cash and cash equivalents:    
Beginning of period 11,226 9,730
End of period 13,785 19,397
Supplemental non-cash transactions:    
Change in accrued capital expenditures 8,396 (19,230)
Change in asset retirement obligations $ 787 $ 1,212