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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income (loss) including non-controlling interests $ (312,589) $ 40,393
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by operating activities:    
Depreciation, depletion and amortization 302,835 251,957
Loss on extinguishment of debt 13,651 0
Gain on sale of properties (1,954) 0
Impairment 384,228 5,882
Deferred income taxes (100,293) 18,376
Derivative instruments 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, net (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 Facilities (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
Other (87) (55)
Net cash provided by financing activities 625,070 49,494
Increase in cash and cash equivalents 352 214
Cash and cash equivalents:    
Beginning of period 16,720 11,226
End of period 17,072 11,440
Supplemental non-cash transactions:    
Change in accrued capital expenditures 90,040 19,017
Change in asset retirement obligations 5,407 1,759
Issuance of shares in connection with the Permian Basin Acquisition 371,220 0
Installment notes from acquisition $ 0 $ 4,875