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Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net loss $ (64,455) $ (18,041)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 122,449 118,478
Gain on extinguishment of debt (7,016) 0
Impairment 3,562 5,321
Deferred income taxes (27,629) (7,376)
Derivative instruments (14,375) (47,072)
Stock-based compensation expenses 6,730 7,606
Deferred financing costs amortization and other 5,066 1,655
Working capital and other changes:    
Change in accounts receivable (995) 63,313
Change in inventory 349 (602)
Change in prepaid expenses 241 1,892
Change in other current assets 4 5,539
Change in other assets 77 0
Change in accounts payable, interest payable and accrued liabilities (64,056) (42,341)
Change in other current liabilities (6,000) 0
Change in other liabilities (3) (11)
Net cash provided by (used in) operating activities (46,051) 88,361
Cash flows from investing activities:    
Capital expenditures (103,411) (359,113)
Derivative settlements 73,313 109,259
Advances from joint interest partners (257) (828)
Net cash used in investing activities (30,355) (250,682)
Cash flows from financing activities:    
Repurchase of senior unsecured notes (22,308) 0
Proceeds from revolving credit facility 214,000 145,000
Principal payments on revolving credit facility (287,000) (480,000)
Deferred financing costs (751) 0
Proceeds from sale of common stock 183,164 463,218
Purchases of treasury stock (1,032) (1,520)
Net cash provided by financing activities 86,073 126,698
Increase (decrease) in cash and cash equivalents 9,667 (35,623)
Cash and cash equivalents:    
Beginning of period 9,730 45,811
End of period 19,397 10,188
Supplemental non-cash transactions:    
Change in accrued capital expenditures (19,230) (90,189)
Change in asset retirement obligations $ 1,212 $ 1,413