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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.

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