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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, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income $ 3,712 $ 23,825
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 149,265 126,666
Impairment 93 2,682
Deferred income taxes 828 16,037
Derivative instruments 71,116 (56,075)
Equity-based compensation expenses 6,754 6,708
Deferred financing costs amortization and other 5,475 4,940
Working capital and other changes:    
Change in accounts receivable (5,708) (22,478)
Change in inventory (3,672) (3,679)
Change in prepaid expenses 492 282
Change in other current assets 0 (110)
Change in long-term inventory and other assets (315) (4)
Change in accounts payable, interest payable and accrued liabilities (244) 6,060
Change in other current liabilities 0 2,945
Change in other liabilities 563 0
Net cash provided by operating activities 228,359 107,799
Cash flows from investing activities:    
Capital expenditures (254,838) (96,047)
Acquisitions (520,728)  
Derivative settlements (36,974) (7,960)
Advances from joint interest partners (28) (759)
Net cash used in investing activities (812,568) (104,766)
Cash flows from financing activities:    
Proceeds from Revolving Credit Facilities 1,470,000 246,000
Principal payments on revolving credit facility (875,000) (241,000)
Deferred financing costs (215) 0
Purchases of treasury stock (6,021) (5,419)
Distributions to non-controlling interests (3,450) 0
Investment in / capital contributions from subsidiaries 0 0
Other (90) (55)
Net cash provided by (used in) financing activities 585,224 (474)
Increase in cash and cash equivalents 1,015 2,559
Beginning of period 16,720 11,226
End of period 17,735 13,785
Intercompany Eliminations [Member]    
Cash flows from operating activities:    
Net income (65,442) (49,103)
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries 63,693 49,103
Depreciation, depletion and amortization (3,326) 0
Impairment 0 0
Deferred income taxes 0 0
Derivative instruments 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 (70,526) (45,756)
Change in inventory 0 0
Change in prepaid expenses 0 0
Change in other current assets   0
Change in long-term inventory and other assets 0 0
Change in accounts payable, interest payable and accrued liabilities 70,526 45,756
Change in other current liabilities   0
Change in other liabilities 0  
Net cash provided by operating activities (5,075) 0
Cash flows from investing activities:    
Capital expenditures 0 0
Acquisitions 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
Deferred financing costs 0  
Purchases of treasury stock 0 0
Distributions to non-controlling interests 0  
Investment in / capital contributions from subsidiaries 5,075 0
Other 0 0
Net cash provided by (used in) financing activities 5,075 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 590 23,825
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries (32,164) (49,103)
Depreciation, depletion and amortization 0 0
Impairment 0 0
Deferred income taxes (8,104) (14,638)
Derivative instruments 0 0
Equity-based compensation expenses 6,418 6,498
Deferred financing costs amortization and other 3,929 3,665
Working capital and other changes:    
Change in accounts receivable 51,714 51,230
Change in inventory 0 0
Change in prepaid expenses (180) (59)
Change in other current assets   (2)
Change in long-term inventory and other assets 0 0
Change in accounts payable, interest payable and accrued liabilities (12,832) (13,321)
Change in other current liabilities   0
Change in other liabilities 0  
Net cash provided by operating activities 9,371 8,095
Cash flows from investing activities:    
Capital expenditures 0 0
Acquisitions 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
Deferred financing costs 0  
Purchases of treasury stock (6,021) (5,419)
Distributions to non-controlling interests 0  
Investment in / capital contributions from subsidiaries (3,259) (2,610)
Other (90) (55)
Net cash provided by (used in) financing activities (9,370) (8,084)
Increase in cash and cash equivalents 1 11
Beginning of period 178 166
End of period 179 177
Combined Guarantor Subsidiaries [Member]    
Cash flows from operating activities:    
Net income 37,035 49,103
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:    
Equity in earnings of subsidiaries (31,529) 0
Depreciation, depletion and amortization 146,227 126,666
Impairment 93 2,682
Deferred income taxes 8,932 30,675
Derivative instruments 71,116 (56,075)
Equity-based compensation expenses 273 210
Deferred financing costs amortization and other 1,432 1,275
Working capital and other changes:    
Change in accounts receivable (23,888) (27,952)
Change in inventory (3,672) (3,679)
Change in prepaid expenses 641 341
Change in other current assets   (108)
Change in long-term inventory and other assets (315) (4)
Change in accounts payable, interest payable and accrued liabilities (66,000) (26,375)
Change in other current liabilities   2,945
Change in other liabilities 563  
Net cash provided by operating activities 140,908 99,704
Cash flows from investing activities:    
Capital expenditures (169,994) (96,047)
Acquisitions (520,728)  
Derivative settlements (36,974) (7,960)
Advances from joint interest partners (28) (759)
Net cash used in investing activities (727,724) (104,766)
Cash flows from financing activities:    
Proceeds from Revolving Credit Facilities 1,413,000 246,000
Principal payments on revolving credit facility (857,000) (241,000)
Deferred financing costs (215)  
Purchases of treasury stock 0 0
Distributions to non-controlling interests 34,866  
Investment in / capital contributions from subsidiaries (5,986) 2,610
Other 0 0
Net cash provided by (used in) financing activities 584,665 7,610
Increase in cash and cash equivalents (2,151) 2,548
Beginning of period 15,659 11,060
End of period 13,508 $ 13,608
Non-Guarantor Subsidiaries [Member]    
Cash flows from operating activities:    
Net income 31,529  
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  
Depreciation, depletion and amortization 6,364  
Impairment 0  
Deferred income taxes 0  
Derivative instruments 0  
Equity-based compensation expenses 63  
Deferred financing costs amortization and other 114  
Working capital and other changes:    
Change in accounts receivable 36,992  
Change in inventory 0  
Change in prepaid expenses 31  
Change in long-term inventory and other assets 0  
Change in accounts payable, interest payable and accrued liabilities 8,062  
Change in other liabilities 0  
Net cash provided by operating activities 83,155  
Cash flows from investing activities:    
Capital expenditures (84,844)  
Acquisitions 0  
Derivative settlements 0  
Advances from joint interest partners 0  
Net cash used in investing activities (84,844)  
Cash flows from financing activities:    
Proceeds from Revolving Credit Facilities 57,000  
Principal payments on revolving credit facility (18,000)  
Deferred financing costs 0  
Purchases of treasury stock 0  
Distributions to non-controlling interests (38,316)  
Investment in / capital contributions from subsidiaries 4,170  
Other 0  
Net cash provided by (used in) financing activities 4,854  
Increase in cash and cash equivalents 3,165  
Beginning of period 883  
End of period $ 4,048