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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (in thousands) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Cash flows from operating activities: |  |  |  |  |
Net loss |  | $ (222,995) | $ (89,252) | $ (474,264) | $ (501,147)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |  |  |
Depletion, depreciation, amortization, and asset retirement obligation liability accretion |  | 204,714 | 180,856 | 371,674 | 414,345
Impairment |  | 8,750 | 8,750 | 17,500 | 998,513
Stock-based compensation expense |  |  |  | 9,693 | 11,273
Net derivative (gain) loss |  | 370,348 | 167,200 | 715,037 | (378,140)
Derivative settlement gain (loss) |  |  |  | (266,707) | 215,965
Amortization of debt discount and deferred financing costs |  |  |  | 9,445 | 8,578
(Gain) loss on extinguishment of debt |  | 2,144 | (227,281) | 2,144 | (239,476)
Deferred income taxes |  | (162) | (36,921) | (214) | (136,268)
Other, net |  |  |  | (13,377) | (3,918)
Net change in working capital |  |  |  | 31,092 | (57,254)
Net cash provided by operating activities |  |  |  | 402,023 | 332,471
Cash flows from investing activities: |  |  |  |  |
Capital expenditures |  |  |  | (370,177) | (310,209)
Other, net |  |  |  | 221 | 92
Net cash used in investing activities |  |  |  | (369,956) | (310,117)
Cash flows from financing activities: |  |  |  |  |
Proceeds from revolving credit facility |  |  |  | 944,000 | 841,000
Repayment of revolving credit facility |  |  |  | (984,500) | (770,500)
Net proceeds from Senior Notes |  |  |  | 393,583 | 0
Cash paid to repurchase Senior Notes |  |  |  | (385,296) | (81,826)
Debt issuance costs related to 10.0% Senior Secured Notes due 2025 |  |  |  | 0 | (10,491)
Net proceeds from sale of common stock |  |  |  | 1,315 | 947
Dividends paid |  |  |  | (1,178) | (1,130)
Other |  |  |  | (1) | (354)
Net cash used in financing activities |  |  |  | (32,077) | (22,354)
Net change in cash, cash equivalents, and restricted cash |  |  |  | (10) | 0
Cash, cash equivalents, and restricted cash at beginning of period |  |  |  | 10 | 10
Cash, cash equivalents, and restricted cash at end of period |  | $ 0 | $ 10 | 0 | 10
Supplemental Cash Flow Information - Operating activities: |  |  |  |  |
Cash paid for interest, net of capitalized interest |  |  |  | (74,864) | (82,313)
Supplemental Cash Flow Information - Investing activities: |  |  |  |  |
Increase (decrease) in capital expenditure accruals and other |  |  |  | 28,987 | (28,896)
Supplemental Cash Flow Information - Investing activities: |  |  |  |  |
Non-cash investing and financing activities (1) | [1] |  |  |  |
[1] | (1) Please refer to Note 5 - Long-Term Debt for discussion of the debt transactions executed during the six months ended June 30, 2021, and 2020.

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