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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Cash flows from operating activities: |  |
Net loss | $ (292,720,000) | $ (697,165,000)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |
Depreciation, depletion, amortization and impairment | 437,984,000 | 517,201,000
Impairment of goodwill | 0 | 395,060,000
Dry holes and abandonments | 177,000 | 1,256,000
Deferred income tax benefit | (54,754,000) | (100,212,000)
Stock-based compensation expense | 16,873,000 | 20,087,000
Net gain on asset disposals | (5,595,000) | (3,357,000)
Net gain on insurance reimbursement | 0 | (4,172,000)
Writedown of capacity reservation contract | 0 | 9,207,000
Credit loss expense | 0 | 5,606,000
Restructuring expenses, non-cash | 0 | 24,068,000
Amortization of debt discount and issuance costs | 620,000 | 673,000
Changes in operating assets and liabilities: |  |
Accounts receivable | (103,241,000) | 202,733,000
Income taxes receivable/payable | 4,378,000 | 1,285,000
Inventory and other assets | 1,486,000 | 22,250,000
Accounts payable | 59,357,000 | (57,788,000)
Accrued liabilities | (8,009,000) | (44,607,000)
Other liabilities | (4,958,000) | (8,840,000)
Net cash provided by operating activities | 51,598,000 | 283,285,000
Cash flows from investing activities: |  |
Purchases of property and equipment | (90,837,000) | (135,043,000)
Proceeds from disposal of assets and insurance claims | 20,558,000 | 17,792,000
Other | (345,000) | (121,000)
Net cash used in investing activities | (70,624,000) | (117,372,000)
Cash flows from financing activities: |  |
Purchases of treasury stock | (3,574,000) | (21,129,000)
Dividends paid | (11,303,000) | (15,110,000)
Debt issuance costs | 0 | 145,000
Net cash used in financing activities | (14,877,000) | (36,384,000)
Effect of foreign exchange rate changes on cash | 272,000 | 27,000
Net increase (decrease) in cash and cash equivalents | (33,631,000) | 129,556,000
Cash and cash equivalents at beginning of period | 224,915,000 | 174,185,000
Cash and cash equivalents at end of period | 191,284,000 | 303,741,000
Net cash received (paid) during the period for: |  |
Interest, net of capitalized interest of $117 in 2021 and $425 in 2020 | (31,031,000) | (32,605,000)
Income taxes | 4,196,000 | 3,550,000
Non-cash investing and financing activities: |  |
Net increase (decrease) in payables for purchases of property and equipment | 14,801,000 | (38,312,000)
Net (increase) decrease in deposits on equipment purchases | $ (66,000) | $ 3,338,000

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