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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:        
Net income (loss) $ (316,301) $ 16,568 $ (312,589) $ 40,393
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:        
Equity in earnings of subsidiaries 0 0 0 0
Depreciation, depletion and amortization 153,570 125,291 302,835 251,957
Loss on extinguishment of debt 13,651 0 13,651 0
Gain on sale of properties (1,954) 0 (1,954) 0
Impairment 384,135 3,200 384,228 5,882
Deferred income taxes     (100,293) 18,376
Derivative instruments 120,285 (50,532) 191,401 (106,607)
Equity-based compensation expenses     14,130 13,823
Deferred financing costs amortization and other     10,518 8,871
Working capital and other changes:        
Change in accounts receivable     (5,866) (13,743)
Change in inventory     (4,721) (1,007)
Change in prepaid expenses     573 (264)
Change in other current assets     111 280
Change in long-term inventory and other assets     (381) (8,768)
Change in accounts payable, interest payable and accrued liabilities     40,849 11,158
Change in other current liabilities     0 (10,490)
Change in other liabilities     (476) 0
Net cash provided by operating activities     532,016 209,861
Cash flows from investing activities:        
Capital expenditures     (536,959) (252,461)
Acquisitions     (524,255) 0
Proceeds from sale of properties     2,236 4,000
Derivative settlements     (96,823) (8,899)
Advances from joint interest partners     (933) (1,781)
Net cash used in investing activities     (1,156,734) (259,141)
Cash flows from financing activities:        
Proceeds from Revolving Credit Facilities     1,933,000 484,000
Principal payments on revolving credit facility     (1,265,000) (429,000)
Repurchase of senior unsecured notes     (423,143) 0
Proceeds from issuance of senior unsecured notes     400,000 0
Deferred financing costs     (6,790) 0
Purchases of treasury stock     (6,064) (5,451)
Distributions to non-controlling interests     (6,846) 0
Investment in / capital contributions from subsidiaries     0 0
Other     (87) (55)
Net cash provided by financing activities     625,070 49,494
Increase in cash and cash equivalents     352 214
Beginning of period     16,720 11,226
End of period 17,072 11,440 17,072 11,440
Intercompany Eliminations [Member]        
Cash flows from operating activities:        
Net income (loss) 237,876   172,434 (87,978)
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:        
Equity in earnings of subsidiaries (240,529) 38,875 (176,836) 87,978
Depreciation, depletion and amortization (3,643) 0 (6,969) 0
Loss on extinguishment of debt 0   0  
Gain on sale of properties 0   0  
Impairment 0 0 0 0
Deferred income taxes     0 0
Derivative instruments 0 0 0 0
Equity-based compensation expenses     0 0
Deferred financing costs amortization and other     0 0
Working capital and other changes:        
Change in accounts receivable     (124,088) (58,414)
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     124,088 58,414
Change in other current liabilities       0
Change in other liabilities     0  
Net cash provided by operating activities     (11,371) 0
Cash flows from investing activities:        
Capital expenditures     0 0
Acquisitions     0  
Proceeds from sale of properties     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 Facilities     0 0
Principal payments on revolving credit facility     0 0
Repurchase of senior unsecured notes     0  
Proceeds from issuance of senior unsecured notes     0  
Deferred financing costs     0  
Purchases of treasury stock     0 0
Distributions to non-controlling interests     0  
Investment in / capital contributions from subsidiaries     11,371 0
Other     0 0
Net cash provided by financing activities     11,371 0
Increase 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) (320,204)   (319,614) 40,393
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:        
Equity in earnings of subsidiaries 278,014 (38,875) 245,850 (87,978)
Depreciation, depletion and amortization 0 0 0 0
Loss on extinguishment of debt 13,651   13,651  
Gain on sale of properties 0   0  
Impairment 0 0 0 0
Deferred income taxes     (20,196) (32,871)
Derivative instruments 0 0 0 0
Equity-based compensation expenses     13,340 13,395
Deferred financing costs amortization and other     7,892 7,470
Working capital and other changes:        
Change in accounts receivable     96,993 64,504
Change in inventory     0 0
Change in prepaid expenses     58 (389)
Change in other current assets     0 (3)
Change in long-term inventory and other assets     0 0
Change in accounts payable, interest payable and accrued liabilities     3,335 6,185
Change in other current liabilities       0
Change in other liabilities     0  
Net cash provided by operating activities     41,309 10,706
Cash flows from investing activities:        
Capital expenditures     0 0
Acquisitions     0  
Proceeds from sale of properties     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 Facilities     0 0
Principal payments on revolving credit facility     0 0
Repurchase of senior unsecured notes     (423,143)  
Proceeds from issuance of senior unsecured notes     400,000  
Deferred financing costs     (6,524)  
Purchases of treasury stock     (6,064) (5,451)
Distributions to non-controlling interests     0  
Investment in / capital contributions from subsidiaries     (5,619) (5,188)
Other     38 (55)
Net cash provided by financing activities     (41,312) (10,694)
Increase in cash and cash equivalents     (3) 12
Beginning of period     178 166
End of period 175 178 175 178
Combined Guarantor Subsidiaries [Member]        
Cash flows from operating activities:        
Net income (loss) (271,458)   (234,423) 87,978
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:        
Equity in earnings of subsidiaries (37,485) 0 (69,014) 0
Depreciation, depletion and amortization 150,554 125,291 296,781 251,957
Loss on extinguishment of debt 0   0  
Gain on sale of properties (1,954)   (1,954)  
Impairment 384,135 3,200 384,228 5,882
Deferred income taxes     (80,097) 51,247
Derivative instruments 120,285 (50,532) 191,401 (106,607)
Equity-based compensation expenses     624 428
Deferred financing costs amortization and other     2,522 1,401
Working capital and other changes:        
Change in accounts receivable     (8,178) (19,833)
Change in inventory     (4,629) (1,007)
Change in prepaid expenses     95 125
Change in other current assets     111 283
Change in long-term inventory and other assets     (381) (8,768)
Change in accounts payable, interest payable and accrued liabilities     (90,679) (53,441)
Change in other current liabilities       (10,490)
Change in other liabilities     (476)  
Net cash provided by operating activities     385,931 199,155
Cash flows from investing activities:        
Capital expenditures     (381,971) (252,461)
Acquisitions     (524,255)  
Proceeds from sale of properties     2,236 4,000
Derivative settlements     (96,823) (8,899)
Advances from joint interest partners     (933) (1,781)
Net cash used in investing activities     (1,001,746) (259,141)
Cash flows from financing activities:        
Proceeds from Revolving Credit Facilities     1,820,000 484,000
Principal payments on revolving credit facility     (1,239,000) (429,000)
Repurchase of senior unsecured notes     0  
Proceeds from issuance of senior unsecured notes     0  
Deferred financing costs     (266)  
Purchases of treasury stock     0 0
Distributions to non-controlling interests     48,911  
Investment in / capital contributions from subsidiaries     (15,216) 5,188
Other     (125) 0
Net cash provided by financing activities     614,304 60,188
Increase in cash and cash equivalents     (1,511) 202
Beginning of period     15,659 11,060
End of period 14,148 $ 11,262 14,148 $ 11,262
Non-Guarantor Subsidiaries [Member]        
Cash flows from operating activities:        
Net income (loss) 37,485   69,014  
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:        
Equity in earnings of subsidiaries 0   0  
Depreciation, depletion and amortization 6,659   13,023  
Loss on extinguishment of debt 0   0  
Gain on sale of properties 0   0  
Impairment 0   0  
Deferred income taxes     0  
Derivative instruments 0   0  
Equity-based compensation expenses     166  
Deferred financing costs amortization and other     104  
Working capital and other changes:        
Change in accounts receivable     29,407  
Change in inventory     (92)  
Change in prepaid expenses     420  
Change in other current assets     0  
Change in long-term inventory and other assets     0  
Change in accounts payable, interest payable and accrued liabilities     4,105  
Change in other liabilities     0  
Net cash provided by operating activities     116,147  
Cash flows from investing activities:        
Capital expenditures     (154,988)  
Acquisitions     0  
Proceeds from sale of properties     0  
Derivative settlements     0  
Advances from joint interest partners     0  
Net cash used in investing activities     (154,988)  
Cash flows from financing activities:        
Proceeds from Revolving Credit Facilities     113,000  
Principal payments on revolving credit facility     (26,000)  
Repurchase of senior unsecured notes     0  
Proceeds from issuance of senior unsecured notes     0  
Deferred financing costs     0  
Purchases of treasury stock     0  
Distributions to non-controlling interests     (55,757)  
Investment in / capital contributions from subsidiaries     9,464  
Other     0  
Net cash provided by financing activities     40,707  
Increase in cash and cash equivalents     1,866  
Beginning of period     883  
End of period $ 2,749   $ 2,749