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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Details) - 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 to cash provided by operating activities:    
Equity in loss of subsidiaries 0 0
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)
Investment in / capital contributions from subsidiaries 0 0
Other (55) 0
Net cash provided by (used in) financing activities (474) 86,073
Increase in cash and cash equivalents 2,559 9,667
Beginning of period 11,226 9,730
End of period 13,785 19,397
Intercompany Eliminations [Member]    
Cash flows from operating activities:    
Net income (loss) (49,103) 37,327
Adjustments to reconcile net income to cash provided by operating activities:    
Equity in loss of subsidiaries 49,103 (37,327)
Depreciation, depletion and amortization 0 0
Gain on extinguishment of debt   0
Impairment 0 0
Deferred income taxes 0 0
Derivative instruments 0 0
Stock-based compensation expenses 0 0
Deferred financing costs amortization and other 0 0
Working capital and other changes:    
Change in accounts receivable (45,756) (97,263)
Change in inventory 0 0
Change in prepaid expenses 0 0
Change in other current assets 0 0
Change in other assets 0 0
Change in accounts payable, interest payable and accrued liabilities 45,756 97,263
Change in other current liabilities 0 0
Change in other liabilities   0
Net cash provided by (used in) operating activities 0 0
Cash flows from investing activities:    
Capital expenditures 0 0
Derivative settlements 0 0
Advances from joint interest partners 0 0
Net cash used in investing activities 0 0
Cash flows from financing activities:    
Proceeds from revolving credit facility 0 0
Principal payments on revolving credit facility 0 0
Repurchase of senior unsecured notes   0
Deferred financing costs   0
Proceeds from sale of common stock   0
Purchases of treasury stock 0 0
Investment in / capital contributions from subsidiaries 0 0
Other 0  
Net cash provided by (used in) financing activities 0 0
Increase in cash and cash equivalents 0 0
Beginning of period 0 0
End of period 0 0
Parent/Issuer [Member]    
Cash flows from operating activities:    
Net income (loss) 23,825 (64,455)
Adjustments to reconcile net income to cash provided by operating activities:    
Equity in loss of subsidiaries (49,103) 37,327
Depreciation, depletion and amortization 0 0
Gain on extinguishment of debt   (7,016)
Impairment 0 0
Deferred income taxes (14,638) (8,096)
Derivative instruments 0 0
Stock-based compensation expenses 6,498 6,547
Deferred financing costs amortization and other 3,665 1,701
Working capital and other changes:    
Change in accounts receivable 51,230 (85)
Change in inventory 0 0
Change in prepaid expenses (59) 139
Change in other current assets (2) 0
Change in other assets 0 77
Change in accounts payable, interest payable and accrued liabilities (13,321) (122,242)
Change in other current liabilities 0 0
Change in other liabilities   0
Net cash provided by (used in) operating activities 8,095 (156,103)
Cash flows from investing activities:    
Capital expenditures 0 0
Derivative settlements 0 0
Advances from joint interest partners 0 0
Net cash used in investing activities 0 0
Cash flows from financing activities:    
Proceeds from revolving credit facility 0 0
Principal payments on revolving credit facility 0 0
Repurchase of senior unsecured notes   (22,308)
Deferred financing costs   0
Proceeds from sale of common stock   183,164
Purchases of treasury stock (5,419) (1,032)
Investment in / capital contributions from subsidiaries (2,610) (4,408)
Other (55)  
Net cash provided by (used in) financing activities (8,084) 155,416
Increase in cash and cash equivalents 11 (687)
Beginning of period 166 777
End of period 177 90
Combined Guarantor Subsidiaries [Member]    
Cash flows from operating activities:    
Net income (loss) 49,103 (37,327)
Adjustments to reconcile net income to cash provided by operating activities:    
Equity in loss of subsidiaries 0 0
Depreciation, depletion and amortization 126,666 122,449
Gain on extinguishment of debt   0
Impairment 2,682 3,562
Deferred income taxes 30,675 (19,533)
Derivative instruments (56,075) (14,375)
Stock-based compensation expenses 210 183
Deferred financing costs amortization and other 1,275 3,365
Working capital and other changes:    
Change in accounts receivable (27,952) 96,353
Change in inventory (3,679) 349
Change in prepaid expenses 341 102
Change in other current assets (108) 4
Change in other assets (4) 0
Change in accounts payable, interest payable and accrued liabilities (26,375) (39,077)
Change in other current liabilities 2,945 (6,000)
Change in other liabilities   (3)
Net cash provided by (used in) operating activities 99,704 110,052
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
Deferred financing costs   (751)
Proceeds from sale of common stock   0
Purchases of treasury stock 0 0
Investment in / capital contributions from subsidiaries 2,610 4,408
Other 0  
Net cash provided by (used in) financing activities 7,610 (69,343)
Increase in cash and cash equivalents 2,548 10,354
Beginning of period 11,060 8,953
End of period $ 13,608 $ 19,307