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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Cash flows from operating activities:          
Net income (loss) $ (33,942) $ 27,055 $ (188,328) $ (44,216)  
Adjustments to reconcile net loss to cash provided by (used in) operating activities:          
Equity in loss of subsidiaries 0 0 0 0  
Depreciation, depletion and amortization 111,948 123,734 356,885 361,430  
Gain on extinguishment of debt 13,793 0 (4,865) 0  
Gain (loss) on sale of properties     1,305 (172)  
Impairment 382 80 3,967 24,917  
Deferred income taxes     (96,818) (17,829)  
Derivative instruments (20,847) (103,637) 55,624 (111,285)  
Stock-based compensation expenses     18,761 19,629  
Deferred financing costs amortization and other     10,174 7,468  
Working capital and other changes:          
Change in accounts receivable     11,349 108,309  
Change in inventory     2,559 8,425  
Change in prepaid expenses     1,168 638  
Change in other current assets     (240) 5,529  
Change in other assets     (148) 0  
Change in accounts payable, interest payable and accrued liabilities     (41,991) (84,133)  
Change in other current liabilities     (6,000) 1,655  
Change in other liabilities     17 (28)  
Net cash provided by operating activities     123,419 280,337  
Cash flows from investing activities:          
Capital expenditures     (340,314) (740,633)  
Proceeds from sale of properties     12,333 78  
Proceeds from sale of properties       78  
Costs related to sale of properties     (310) 0  
Derivative settlements     115,576 291,436  
Advances from joint interest partners     544 (1,239)  
Net cash used in investing activities     (212,171) (450,358)  
Cash flows from financing activities:          
Repurchase of senior unsecured notes     (435,907) 0  
Proceeds from issuance of senior unsecured convertible notes     300,000 0  
Proceeds from revolving credit facility     835,000 618,000  
Principal payments on revolving credit facility     (778,000) (938,000)  
Deferred financing costs     (8,811) (3,587)  
Proceeds from sale of common stock     182,791 462,833  
Purchases of treasury stock     (2,275) (2,771)  
Investment in / capital contributions from subsidiaries     0 0  
Net cash provided by financing activities     92,798 136,475  
Increase (decrease) in cash and cash equivalents     4,046 (33,546)  
Beginning of period     9,730 45,811 $ 45,811
End of period 13,776 12,265 13,776 12,265 9,730
Intercompany Eliminations [Member]          
Cash flows from operating activities:          
Net income (loss) 1,140 (49,899) 110,454 (28,269)  
Adjustments to reconcile net loss to cash provided by (used in) operating activities:          
Equity in loss of subsidiaries (1,140) 49,899 (110,454) 28,269  
Depreciation, depletion and amortization 0 0 0 0  
Gain on extinguishment of debt 0   0    
Gain (loss) on sale of properties     0 0  
Impairment 0 0 0 0  
Deferred income taxes     0 0  
Derivative instruments 0 0 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     99,943 130,802  
Change in inventory     0 0  
Change in prepaid expenses     0 0  
Change in other current assets     0 0  
Change in other assets     0    
Change in accounts payable, interest payable and accrued liabilities     (99,943) (130,802)  
Change in other current liabilities     0 0  
Change in other liabilities     0 0  
Net cash provided by operating activities     0 0  
Cash flows from investing activities:          
Capital expenditures     0 0  
Proceeds from sale of properties     0    
Proceeds from sale of properties       0  
Costs related to sale of properties     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:          
Repurchase of senior unsecured notes     0    
Proceeds from issuance of senior unsecured convertible notes     0    
Proceeds from revolving credit facility     0 0  
Principal payments on revolving credit facility     0 0  
Deferred financing costs     0 0  
Proceeds from sale of common stock     0 0  
Purchases of treasury stock     0 0  
Investment in / capital contributions from subsidiaries     0 0  
Net cash provided by financing activities     0 0  
Increase (decrease) in cash and cash equivalents     0 0  
Beginning of period     0 0 0
End of period 0 0 0 0 0
Parent/Issuer [Member]          
Cash flows from operating activities:          
Net income (loss) (33,942) 27,055 (188,328) (44,216)  
Adjustments to reconcile net loss to cash provided by (used in) operating activities:          
Equity in loss of subsidiaries 1,140 (49,899) 110,454 (28,269)  
Depreciation, depletion and amortization 0 0 0 0  
Gain on extinguishment of debt 13,793   (4,865)    
Gain (loss) on sale of properties     0 0  
Impairment 0 0 0 0  
Deferred income taxes     (34,891) (51,792)  
Derivative instruments 0 0 0 0  
Stock-based compensation expenses     18,195 19,276  
Deferred financing costs amortization and other     5,371 3,401  
Working capital and other changes:          
Change in accounts receivable     (85) (493)  
Change in inventory     0 0  
Change in prepaid expenses     (135) (120)  
Change in other current assets     0 0  
Change in other assets     100    
Change in accounts payable, interest payable and accrued liabilities     70,285 105,536  
Change in other current liabilities     0 0  
Change in other liabilities     0 0  
Net cash provided by operating activities     (23,899) 3,323  
Cash flows from investing activities:          
Capital expenditures     0 0  
Proceeds from sale of properties     0    
Proceeds from sale of properties       0  
Costs related to sale of properties     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:          
Repurchase of senior unsecured notes     (435,907)    
Proceeds from issuance of senior unsecured convertible notes     300,000    
Proceeds from revolving credit facility     0 0  
Principal payments on revolving credit facility     0 0  
Deferred financing costs     (7,880) 0  
Proceeds from sale of common stock     182,791 462,833  
Purchases of treasury stock     (2,275) (2,771)  
Investment in / capital contributions from subsidiaries     (13,517) (463,404)  
Net cash provided by financing activities     23,212 (3,342)  
Increase (decrease) in cash and cash equivalents     (687) (19)  
Beginning of period     777 776 776
End of period 90 757 90 757 777
Combined Guarantor Subsidiaries [Member]          
Cash flows from operating activities:          
Net income (loss) (1,140) 49,899 (110,454) 28,269  
Adjustments to reconcile net loss to cash provided by (used in) operating activities:          
Equity in loss of subsidiaries 0 0 0 0  
Depreciation, depletion and amortization 111,948 123,734 356,885 361,430  
Gain on extinguishment of debt 0   0    
Gain (loss) on sale of properties     1,305 (172)  
Impairment 382 80 3,967 24,917  
Deferred income taxes     (61,927) 33,963  
Derivative instruments (20,847) (103,637) 55,624 (111,285)  
Stock-based compensation expenses     566 353  
Deferred financing costs amortization and other     4,803 4,067  
Working capital and other changes:          
Change in accounts receivable     (88,509) (22,000)  
Change in inventory     2,559 8,425  
Change in prepaid expenses     1,303 758  
Change in other current assets     (240) 5,529  
Change in other assets     (248)    
Change in accounts payable, interest payable and accrued liabilities     (12,333) (58,867)  
Change in other current liabilities     (6,000) 1,655  
Change in other liabilities     17 (28)  
Net cash provided by operating activities     147,318 277,014  
Cash flows from investing activities:          
Capital expenditures     (340,314) (740,633)  
Proceeds from sale of properties     12,333    
Proceeds from sale of properties       78  
Costs related to sale of properties     (310)    
Derivative settlements     115,576 291,436  
Advances from joint interest partners     544 (1,239)  
Net cash used in investing activities     (212,171) (450,358)  
Cash flows from financing activities:          
Repurchase of senior unsecured notes     0    
Proceeds from issuance of senior unsecured convertible notes     0    
Proceeds from revolving credit facility     835,000 618,000  
Principal payments on revolving credit facility     (778,000) (938,000)  
Deferred financing costs     (931) (3,587)  
Proceeds from sale of common stock     0 0  
Purchases of treasury stock     0 0  
Investment in / capital contributions from subsidiaries     13,517 463,404  
Net cash provided by financing activities     69,586 139,817  
Increase (decrease) in cash and cash equivalents     4,733 (33,527)  
Beginning of period     8,953 45,035 45,035
End of period $ 13,686 $ 11,508 $ 13,686 $ 11,508 $ 8,953