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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (in thousands) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (251,269) $ (411,895)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depletion, depreciation, amortization, and asset retirement obligation liability accretion 166,960 233,489
Impairment 8,750 989,763
Stock-based compensation expense 5,737 5,561
Net derivative (gain) loss 344,689 (545,340)
Derivative settlement gain (loss) (107,885) 73,437
Amortization of debt discount and deferred financing costs 4,723 3,992
Gain on extinguishment of debt 0 (12,195)
Deferred income taxes (52) (99,347)
Other, net (14,592) (816)
Net change in working capital (51,437) (18,517)
Net cash provided by operating activities 105,624 218,132
Cash flows from investing activities:    
Capital expenditures (147,563) (139,306)
Other (71) 0
Net cash used in investing activities (147,634) (139,306)
Cash flows from financing activities:    
Proceeds from revolving credit facility 440,000 425,500
Repayment of revolving credit facility (398,000) (476,000)
Cash paid to repurchase Senior Notes 0 (28,318)
Other 0 (3)
Net cash provided by (used in) financing activities 42,000 (78,821)
Net change in cash, cash equivalents, and restricted cash (10) 5
Cash, cash equivalents, and restricted cash at beginning of period 10 10
Cash, cash equivalents, and restricted cash at end of period 0 15
Supplemental Cash Flow Information - Operating activities:    
Cash paid for interest, net of capitalized interest (53,449) (47,469)
Supplemental Cash Flow Information - Investing activities:    
Increase in capital expenditure accruals and other $ 37,409 $ 16,802