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CONSOLIDATED STATEMENTS OF CASH FLOWS (in thousands) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net income (loss) $ (764,614) $ (187,001) $ 508,407
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Net gain on divestiture activity (91) (862) (426,917)
Depletion, depreciation, amortization, and asset retirement obligation liability accretion 784,987 823,798 665,313
Impairment 1,016,013 33,842 49,889
Stock-based compensation expense 14,999 24,318 23,908
Net derivative (gain) loss (161,576) 97,539 (161,832)
Derivative settlement gain (loss) 351,261 39,222 (135,803)
Amortization of debt discount and deferred financing costs 17,704 15,474 15,258
(Gain) loss on extinguishment of debt (280,081) 0 26,740
Deferred income taxes (192,540) (41,835) 141,708
Other, net (6,709) 2,220 287
Changes in working capital:      
Accounts receivable 29,100 (39,556) (20,775)
Prepaid expenses and other 5,873 6,130 (729)
Accounts payable and accrued expenses (23,382) 50,278 35,175
Net cash provided by operating activities 790,944 823,567 720,629
Cash flows from investing activities:      
Net proceeds from the sale of oil and gas properties 92 13,059 748,509
Capital expenditures (547,785) (1,023,769) (1,303,188)
Acquisition of proved and unproved oil and gas properties (7,873) (2,581) (33,255)
Net cash used in investing activities (555,566) (1,013,291) (587,934)
Cash flows from financing activities:      
Proceeds from revolving credit facility 1,447,000 1,589,000 0
Repayment of revolving credit facility (1,476,500) (1,466,500) 0
Debt issuance costs related to 10.0% Senior Secured Notes due 2025 (13,069) 0 0
Net proceeds from Senior Notes 0 0 492,079
Cash paid to repurchase Senior Notes (189,998) 0 (845,002)
Net proceeds from sale of common stock 1,464 3,209 3,187
Dividends paid (2,276) (11,254) (11,191)
Other, net (1,999) (2,686) (7,746)
Net cash provided by (used in) financing activities (235,378) 111,769 (368,673)
Net change in cash, cash equivalents, and restricted cash 0 (77,955) (235,978)
Cash, cash equivalents, and restricted cash at beginning of period 10 77,965 313,943
Cash, cash equivalents, and restricted cash at end of period 10 10 77,965
Supplemental Cash Flow Information - Operating Activities:      
Cash paid for interest, net of capitalized interest (140,493) (141,902) (150,727)
Net cash (paid) refunded for income taxes 6,664 6,109 (2,995)
Supplemental Cash Flow Information - Investing Activities:      
Decrease in capital expenditure accruals and other (7,965) (24,289) (2,774)
Non-cash investing and financing activities      
Non-cash investing and financing activities (1)(2) [1],[2]
[1] (1)    Please refer to Note 3 – Acquisitions, Divestitures, and Assets Held for Sale for discussion of the carrying value of properties exchanged during the years ended December 31, 2020, 2019, and 2018.
[2] (2)    Please refer to Note 5 – Long-Term Debt for discussion of the debt transactions executed during the years ended December 31, 2020, and 2018.