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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
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:        
Net income (loss) $ 16,568 $ (89,931) $ 40,393 $ (154,386)
Adjustments to reconcile net income to net cash provided by operating activities:        
Equity in earnings of subsidiaries 0 0 0 0
Depreciation, depletion and amortization 125,291 122,488 251,957 244,937
Loss on extinguishment of debt 0 (11,642) 0 (18,658)
Loss on sale of properties     0 1,311
Impairment 3,200 23 5,882 3,585
Deferred income taxes     18,376 (80,127)
Derivative instruments (50,532) 90,846 (106,607) 76,471
Stock-based compensation expenses     13,823 12,979
Deferred financing costs amortization and other     8,871 6,552
Working capital and other changes:        
Change in accounts receivable     (13,743) 4,297
Change in inventory     (1,007) 2,054
Change in prepaid expenses     (264) 1,423
Change in other current assets     280 (114)
Change in long-term inventory and other assets     (8,768) 100
Change in accounts payable, interest payable and accrued liabilities     11,158 (18,034)
Change in other current liabilities     (10,490) 9,001
Change in other liabilities     0 10
Net cash provided by operating activities     209,861 91,401
Cash flows from investing activities:        
Capital expenditures     (252,461) (231,341)
Proceeds from sale of properties     4,000 11,679
Costs related to sale of properties     0 (310)
Derivative settlements     (8,899) 103,790
Advances from joint interest partners     (1,781) 769
Net cash used in investing activities     (259,141) (115,413)
Cash flows from financing activities:        
Proceeds from revolving credit facility     484,000 359,000
Principal payments on revolving credit facility     (429,000) (462,000)
Repurchase of senior unsecured notes     0 (56,925)
Deferred financing costs     0 (751)
Proceeds from sale of common stock     0 182,953
Purchases of treasury stock     (5,451) (1,520)
Investment in / capital contributions from subsidiaries     0 0
Other     (55) 0
Net cash provided by financing activities     49,494 20,757
Increase (decrease) in cash and cash equivalents     214 (3,255)
Beginning of period     11,226 9,730
End of period 11,440 6,475 11,440 6,475
Intercompany Eliminations [Member]        
Cash flows from operating activities:        
Net income (loss) (38,875) 71,987 (87,978) 109,314
Adjustments to reconcile net income to net cash provided by operating activities:        
Equity in earnings of subsidiaries 38,875 (71,987) 87,978 (109,314)
Depreciation, depletion and amortization 0 0 0 0
Loss 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     (58,414) (48,686)
Change in inventory     0 0
Change in prepaid expenses     0 0
Change in other current assets     0 0
Change in long-term inventory and other assets     0 0
Change in accounts payable, interest payable and accrued liabilities     58,414 48,686
Change in other current liabilities     0 0
Change in other liabilities       0
Net cash provided by operating activities     0 0
Cash flows from investing activities:        
Capital expenditures     0 0
Proceeds from sale of properties     0 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:        
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 financing activities     0 0
Increase (decrease) in cash and cash equivalents     0 0
Beginning of period     0 0
End of period 0 0 0 0
Parent/Issuer [Member]        
Cash flows from operating activities:        
Net income (loss) 16,568 (89,931) 40,393 (154,386)
Adjustments to reconcile net income to net cash provided by operating activities:        
Equity in earnings of subsidiaries (38,875) 71,987 (87,978) 109,314
Depreciation, depletion and amortization 0 0 0 0
Loss on extinguishment of debt   (11,642)   (18,658)
Loss on sale of properties       0
Impairment 0 0 0 0
Deferred income taxes     (32,871) (18,095)
Derivative instruments 0 0 0 0
Stock-based compensation expenses     13,395 12,624
Deferred financing costs amortization and other     7,470 3,360
Working capital and other changes:        
Change in accounts receivable     64,504 (85)
Change in inventory     0 0
Change in prepaid expenses     (389) 278
Change in other current assets     (3) 0
Change in long-term inventory and other assets     0 100
Change in accounts payable, interest payable and accrued liabilities     6,185 (50,462)
Change in other current liabilities     0 0
Change in other liabilities       0
Net cash provided by operating activities     10,706 (116,010)
Cash flows from investing activities:        
Capital expenditures     0 0
Proceeds from sale of properties     0 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:        
Proceeds from revolving credit facility     0 0
Principal payments on revolving credit facility     0 0
Repurchase of senior unsecured notes       (56,925)
Deferred financing costs       0
Proceeds from sale of common stock       182,953
Purchases of treasury stock     (5,451) (1,520)
Investment in / capital contributions from subsidiaries     (5,188) (9,190)
Other     (55)  
Net cash provided by financing activities     (10,694) 115,318
Increase (decrease) in cash and cash equivalents     12 (692)
Beginning of period     166 777
End of period 178 85 178 85
Combined Guarantor Subsidiaries [Member]        
Cash flows from operating activities:        
Net income (loss) 38,875 (71,987) 87,978 (109,314)
Adjustments to reconcile net income to net cash provided by operating activities:        
Equity in earnings of subsidiaries 0 0 0 0
Depreciation, depletion and amortization 125,291 122,488 251,957 244,937
Loss on extinguishment of debt   0   0
Loss on sale of properties       1,311
Impairment 3,200 23 5,882 3,585
Deferred income taxes     51,247 (62,032)
Derivative instruments (50,532) 90,846 (106,607) 76,471
Stock-based compensation expenses     428 355
Deferred financing costs amortization and other     1,401 3,192
Working capital and other changes:        
Change in accounts receivable     (19,833) 53,068
Change in inventory     (1,007) 2,054
Change in prepaid expenses     125 1,145
Change in other current assets     283 (114)
Change in long-term inventory and other assets     (8,768) 0
Change in accounts payable, interest payable and accrued liabilities     (53,441) (16,258)
Change in other current liabilities     (10,490) 9,001
Change in other liabilities       10
Net cash provided by operating activities     199,155 207,411
Cash flows from investing activities:        
Capital expenditures     (252,461) (231,341)
Proceeds from sale of properties     4,000 11,679
Costs related to sale of properties       (310)
Derivative settlements     (8,899) 103,790
Advances from joint interest partners     (1,781) 769
Net cash used in investing activities     (259,141) (115,413)
Cash flows from financing activities:        
Proceeds from revolving credit facility     484,000 359,000
Principal payments on revolving credit facility     (429,000) (462,000)
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     5,188 9,190
Other     0  
Net cash provided by financing activities     60,188 (94,561)
Increase (decrease) in cash and cash equivalents     202 (2,563)
Beginning of period     11,060 8,953
End of period $ 11,262 $ 6,390 $ 11,262 $ 6,390