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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net loss | $ (803,692,000) | $ (425,703,000) | $ (321,421,000)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |
Depreciation, depletion, amortization and impairment | 670,910,000 | 1,003,873,000 | 916,318,000
Impairment of goodwill | 395,060,000 | 17,800,000 | 211,129,000
Dry holes and abandonments | 1,285,000 | 109,000 | 915,000
Deferred income tax benefit | (125,283,000) | (103,202,000) | (41,185,000)
Stock-based compensation expense | 26,572,000 | 39,328,000 | 37,925,000
Net gain on asset disposals | (3,079,000) | (13,904,000) | (28,958,000)
Net gain on insurance reimbursement | (4,172,000) |  |
Write-down of capacity reservation contract | 9,207,000 | 12,673,000 |
Credit loss expense | 5,606,000 | 5,683,000 | 0
Restructuring expenses, non-cash | 25,067,000 |  |
(Gain) loss on early debt extinguishment | (3,596,000) | 24,023,000 |
Amortization of debt discount and issuance costs | 912,000 | 937,000 | 830,000
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 173,862,000 | 213,588,000 | 23,515,000
Income taxes receivable/payable | 1,635,000 | (3,353,000) | (1,555,000)
Inventory and other assets | 27,192,000 | 29,394,000 | (1,470,000)
Accounts payable | (48,602,000) | (77,686,000) | (69,453,000)
Accrued liabilities | (59,240,000) | (18,218,000) | 4,136,000
Other liabilities | (10,786,000) | (9,139,000) | (56,000)
Net cash provided by operating activities | 278,858,000 | 696,203,000 | 730,670,000
Cash flows from investing activities: |  |  |
Acquisitions, net of cash acquired |  | (13,000) | (14,211,000)
Purchases of property and equipment | (145,481,000) | (347,512,000) | (641,458,000)
Proceeds from disposal of assets and insurance claims | 20,929,000 | 45,761,000 | 47,357,000
Collection of note receivable |  |  | 23,760,000
Other | (424,000) |  |
Net cash used in investing activities | (124,976,000) | (301,764,000) | (584,552,000)
Cash flows from financing activities: |  |  |
Purchases of treasury stock | (21,179,000) | (255,467,000) | (161,737,000)
Dividends paid | (18,862,000) | (32,428,000) | (30,589,000)
Proceeds from long-term debt |  | 496,969,000 | 521,194,000
Repayment of long-term debt | (62,525,000) | (673,443,000) |
Proceeds from borrowings under revolving credit facility |  |  | 79,000,000
Repayment of borrowings under revolving credit facility |  |  | (347,000,000)
Debt issuance costs | (584,000) | (852,000) | (4,489,000)
Proceeds from exercise of stock options |  |  | 485,000
Net cash provided by (used in) financing activities | (103,150,000) | (465,221,000) | 56,864,000
Effect of foreign exchange rate changes on cash | (2,000) | (62,000) | (781,000)
Net increase (decrease) in cash and cash equivalents | 50,730,000 | (70,844,000) | 202,201,000
Cash and cash equivalents at beginning of year | 174,185,000 | 245,029,000 | 42,828,000
Cash and cash equivalents at end of year | 224,915,000 | 174,185,000 | 245,029,000
Net cash (paid) received during the year for: |  |  |
Interest, net of capitalized interest of $431 in 2020, $732 in 2019 and $1,435 in 2018 | (43,368,000) | (76,870,000) | (41,184,000)
Income taxes | 3,709,000 | (1,452,000) | 3,172,000
Non-cash investing and financing activities: |  |  |
Receivable from property and equipment insurance |  |  | 15,000,000
Net increase (decrease) in payables for purchases of property and equipment | (30,241,000) | (40,857,000) | 36,241,000
Issuance of common stock for business acquisitions |  |  | 2,932,000
Net decrease in deposits on equipment purchases | $ 6,350,000 | 3,974,000 | $ 4,311,000
Cashless exercise of stock options |  | $ 9,219,000 |

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