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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net loss | $ (654,545) | $ (803,692) | $ (425,703)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |
Depreciation, depletion, amortization and impairment | 849,178 | 670,910 | 1,003,873
Impairment of goodwill | 0 | 395,060 | 17,800
Dry holes and abandonments | 178 | 1,285 | 109
Deferred income tax benefit | (62,980) | (125,283) | (103,202)
Stock-based compensation expense | 21,558 | 26,572 | 39,328
Net gain on asset disposals | (1,426) | (3,079) | (13,904)
Net gain on insurance reimbursement | 0 | (4,172) | 0
Write-down of capacity reservation contract | 0 | 9,207 | 12,673
Credit loss expense | (1,500) | 5,606 | 5,683
Restructuring expenses, non-cash | 0 | 25,067 |
(Gain) loss on early debt extinguishment | 0 | (3,596) | 24,023
Amortization of debt discount and issuance costs | 839 | 912 | 937
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (147,356) | 173,862 | 213,588
Income taxes receivable/payable | 4,516 | 1,635 | (3,353)
Inventory and other assets | (5,850) | 27,192 | 29,394
Accounts payable | 50,941 | (46,576) | (77,281)
Accrued liabilities | 50,271 | (61,266) | (18,623)
Other liabilities | (7,812) | (10,786) | (9,139)
Net cash used in operating activities of discontinued operations | (516) |  |
Net cash provided by operating activities | 95,496 | 278,858 | 696,203
Cash flows from investing activities: |  |  |
Acquisitions, net of cash acquired | (29,358) | 0 | (13)
Purchases of property and equipment | (166,320) | (145,481) | (347,512)
Proceeds from disposal of assets and insurance claims | 23,339 | 20,929 | 45,761
Other | (522) | (424) | 0
Net cash provided by investing activities of discontinued operations | 41,267 |  |
Net cash used in investing activities | (131,594) | (124,976) | (301,764)
Cash flows from financing activities: |  |  |
Purchases of treasury stock | (6,328) | (21,179) | (255,467)
Dividends paid | (15,605) | (18,862) | (32,428)
Proceeds from long-term debt | 0 | 0 | 496,969
Repayment of long-term debt | (50,000) | (62,525) | (673,443)
Debt issuance costs | 0 | (584) | (852)
Net cash used in financing activities | (71,933) | (103,150) | (465,221)
Effect of foreign exchange rate changes on cash | 640 | (2) | (62)
Net increase (decrease) in cash and cash equivalents | (107,391) | 50,730 | (70,844)
Cash and cash equivalents at beginning of year | 224,915 | 174,185 | 245,029
Cash and cash equivalents at end of year | 117,524 | 224,915 | 174,185
Net cash (paid) received during the year for: |  |  |
Interest, net of capitalized interest of $260 in 2021, $431 in 2020 and $732 in 2019 | (40,464) | (43,368) | (76,870)
Income taxes | 4,196 | 3,709 | (1,452)
Non-cash investing and financing activities: |  |  |
Net increase (decrease) in payables for purchases of property and equipment | 31,393 | 30,241 | 40,857
Issuance of common stock for business acquisitions | 248,025 | 0 | 0
Net decrease in deposits on equipment purchases | 867 | 6,350 | 3,974
Cashless exercise of stock options | $ 0 | $ 0 | $ 9,219

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