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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Cash flows from operating activities: |  |
Net loss | $ (209,722,000) | $ (585,054,000)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |
Depreciation, depletion, amortization and impairment | 296,919,000 | 359,882,000
Impairment of goodwill |  | 395,060,000
Dry holes and abandonments | 171,000 | 1,238,000
Deferred income tax benefit | (37,073,000) | (87,219,000)
Stock-based compensation expense | 11,825,000 | 13,495,000
Net gain on asset disposals | (4,052,000) | (2,461,000)
Net gain on insurance reimbursement |  | (4,172,000)
Writedown of capacity reservation contract |  | 9,207,000
Credit loss expense | 0 | 5,606,000
Restructuring expenses, non-cash |  | 30,886,000
Amortization of debt discount and issuance costs | 412,000 | 447,000
Changes in operating assets and liabilities: |  |
Accounts receivable | (36,438,000) | 176,072,000
Income taxes receivable/payable | 4,369,000 | (2,663,000)
Inventory and other assets | (6,423,000) | 16,923,000
Accounts payable | 34,465,000 | (65,915,000)
Accrued liabilities | (8,785,000) | (37,237,000)
Other liabilities | (1,471,000) | (4,762,000)
Net cash provided by operating activities | 44,197,000 | 219,333,000
Cash flows from investing activities: |  |
Purchases of property and equipment | (56,573,000) | (121,601,000)
Proceeds from disposal of assets and insurance claims | 15,145,000 | 7,265,000
Other | (223,000) |
Net cash used in investing activities | (41,651,000) | (114,336,000)
Cash flows from financing activities: |  |
Purchases of treasury stock | (3,522,000) | (20,935,000)
Dividends paid | (7,523,000) | (11,364,000)
Debt issuance costs |  | 145,000
Net cash used in financing activities | (11,045,000) | (32,444,000)
Effect of foreign exchange rate changes on cash | 266,000 | 43,000
Net increase (decrease) in cash and cash equivalents | (8,233,000) | 72,596,000
Cash and cash equivalents at beginning of period | 224,915,000 | 174,185,000
Cash and cash equivalents at end of period | 216,682,000 | 246,781,000
Net cash received (paid) during the period for: |  |
Interest, net of capitalized interest of $56 in 2021 and $406 in 2020 | (20,604,000) | (21,482,000)
Income taxes | 4,226,000 | (402,000)
Non-cash investing and financing activities: |  |
Receivable from property and equipment insurance |  | 6,983,000
Net decrease in payables for purchases of property and equipment | (5,232,000) | (36,894,000)
Net decrease in deposits on equipment purchases | $ 117,000 | $ 1,390,000

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