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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Cash flows from operating activities:          
Net loss $ (89,931) $ (53,230) $ (154,386) $ (71,271)  
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 122,488 119,218 244,937 237,696  
Gain on extinguishment of debt (11,642) 0 (18,658) 0  
Loss on sale of properties     1,311 0  
Impairment 23 19,516 3,585 24,837  
Deferred income taxes     (80,127) (38,221)  
Derivative instruments 90,846 39,424 76,471 (7,648)  
Stock-based compensation expenses     12,979 13,663  
Deferred financing costs amortization and other     6,552 5,059  
Working capital and other changes:          
Change in accounts receivable     4,297 75,799  
Change in inventory     2,054 3,685  
Change in prepaid expenses     1,423 3,394  
Change in other current assets     (114) 5,538  
Change in other assets     100 0  
Change in accounts payable, interest payable and accrued liabilities     (18,034) (22,624)  
Change in other current liabilities     9,001 0  
Change in other liabilities     10 (21)  
Net cash provided by operating activities     91,401 229,886  
Cash flows from investing activities:          
Capital expenditures     (231,341) (587,430)  
Proceeds from sale of properties     11,679 0  
Costs related to sale of properties     (310) 0  
Derivative settlements     103,790 213,336  
Advances from joint interest partners     769 (406)  
Net cash used in investing activities     (115,413) (374,500)  
Cash flows from financing activities:          
Repurchase of senior unsecured notes     (56,925) 0  
Proceeds from revolving credit facility     359,000 320,000  
Principal payments on revolving credit facility     (462,000) (665,000)  
Deferred financing costs     (751) (3,591)  
Proceeds from sale of common stock     182,953 463,010  
Purchases of treasury stock     (1,520) (1,932)  
Investment in / capital contributions from subsidiaries     0 0  
Net cash provided by financing activities     20,757 112,487  
Decrease in cash and cash equivalents     (3,255) (32,127)  
Beginning of period     9,730 45,811 $ 45,811
End of period 6,475 13,684 6,475 13,684 9,730
Intercompany Eliminations [Member]          
Cash flows from operating activities:          
Net loss 71,987 34,249 109,314 21,630  
Adjustments to reconcile net loss to cash provided by (used in) operating activities:          
Equity in loss of subsidiaries (71,987) (34,249) (109,314) (21,630)  
Depreciation, depletion and amortization 0 0 0 0  
Gain on extinguishment of debt 0   0    
Loss on sale of properties     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     (48,686) 66,165  
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     48,686 (66,165)  
Change in other current liabilities     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    
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 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  
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 loss (89,931) (53,230) (154,386) (71,271)  
Adjustments to reconcile net loss to cash provided by (used in) operating activities:          
Equity in loss of subsidiaries 71,987 34,249 109,314 21,630  
Depreciation, depletion and amortization 0 0 0 0  
Gain on extinguishment of debt (11,642)   (18,658)    
Loss on sale of properties     0    
Impairment 0 0 0 0  
Deferred income taxes     (18,095) (34,714)  
Derivative instruments 0 0 0 0  
Stock-based compensation expenses     12,624 13,515  
Deferred financing costs amortization and other     3,360 2,255  
Working capital and other changes:          
Change in accounts receivable     (85) (256)  
Change in inventory     0 0  
Change in prepaid expenses     278 297  
Change in other current assets     0 0  
Change in other assets     100    
Change in accounts payable, interest payable and accrued liabilities     (50,462) 65,933  
Change in other current liabilities     0    
Change in other liabilities     0 0  
Net cash provided by operating activities     (116,010) (2,611)  
Cash flows from investing activities:          
Capital expenditures     0 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     (56,925)    
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     182,953 463,010  
Purchases of treasury stock     (1,520) (1,932)  
Investment in / capital contributions from subsidiaries     (9,190) (458,465)  
Net cash provided by financing activities     115,318 2,613  
Decrease in cash and cash equivalents     (692) 2  
Beginning of period     777 776 776
End of period 85 778 85 778 777
Combined Guarantor Subsidiaries [Member]          
Cash flows from operating activities:          
Net loss (71,987) (34,249) (109,314) (21,630)  
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 122,488 119,218 244,937 237,696  
Gain on extinguishment of debt 0   0    
Loss on sale of properties     1,311    
Impairment 23 19,516 3,585 24,837  
Deferred income taxes     (62,032) (3,507)  
Derivative instruments 90,846 39,424 76,471 (7,648)  
Stock-based compensation expenses     355 148  
Deferred financing costs amortization and other     3,192 2,804  
Working capital and other changes:          
Change in accounts receivable     53,068 9,890  
Change in inventory     2,054 3,685  
Change in prepaid expenses     1,145 3,097  
Change in other current assets     (114) 5,538  
Change in other assets     0    
Change in accounts payable, interest payable and accrued liabilities     (16,258) (22,392)  
Change in other current liabilities     9,001    
Change in other liabilities     10 (21)  
Net cash provided by operating activities     207,411 232,497  
Cash flows from investing activities:          
Capital expenditures     (231,341) (587,430)  
Proceeds from sale of properties     11,679    
Costs related to sale of properties     (310)    
Derivative settlements     103,790 213,336  
Advances from joint interest partners     769 (406)  
Net cash used in investing activities     (115,413) (374,500)  
Cash flows from financing activities:          
Repurchase of senior unsecured notes     0    
Proceeds from revolving credit facility     359,000 320,000  
Principal payments on revolving credit facility     (462,000) (665,000)  
Deferred financing costs     (751) (3,591)  
Proceeds from sale of common stock     0 0  
Purchases of treasury stock     0 0  
Investment in / capital contributions from subsidiaries     9,190 458,465  
Net cash provided by financing activities     (94,561) 109,874  
Decrease in cash and cash equivalents     (2,563) (32,129)  
Beginning of period     8,953 45,035 45,035
End of period $ 6,390 $ 12,906 $ 6,390 $ 12,906 $ 8,953