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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Cash flows from operating activities: |  |
Net loss | $ (585,054) | $ (78,061)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |
Depreciation, depletion, amortization and impairment | 359,882 | 423,098
Impairment of goodwill | 395,060 |
Dry holes and abandonments | 1,238 | 94
Deferred income tax benefit | (87,219) | (14,867)
Stock-based compensation expense | 13,495 | 20,388
Net gain on asset disposals | (2,461) | (10,516)
Net gain on insurance reimbursement | (4,172) |
Writedown of capacity reservation contract | 9,207 | 12,673
Credit loss expense | 5,606 | 3,594
Restructuring expenses, non-cash | 30,886 |
Amortization of debt discount and issuance costs | 447 | 443
Changes in operating assets and liabilities: |  |
Accounts receivable | 176,072 | 54,188
Income taxes receivable/payable | (2,663) | (2,972)
Inventory and other assets | 16,923 | (3,967)
Accounts payable | (65,915) | (16,941)
Accrued liabilities | (37,237) | (18,884)
Other liabilities | (4,762) | (2,971)
Net cash provided by operating activities | 219,333 | 365,299
Cash flows from investing activities: |  |
Acquisitions, net of cash acquired |  | (13)
Purchases of property and equipment | (121,601) | (215,260)
Proceeds from disposal of assets and insurance claims | 7,265 | 31,516
Net cash used in investing activities | (114,336) | (183,757)
Cash flows from financing activities: |  |
Purchases of treasury stock | (20,935) | (154,152)
Dividends paid | (11,364) | (16,843)
Debt issuance costs | (145) |
Net cash provided by financing activities | (32,444) | (170,995)
Effect of foreign exchange rate changes on cash | 43 | (62)
Net increase in cash and cash equivalents | 72,596 | 10,485
Cash and cash equivalents at beginning of period | 174,185 | 245,029
Cash and cash equivalents at end of period | 246,781 | 255,514
Net cash paid during the period for: |  |
Interest, net of capitalized interest of $406 in 2020 and $380 in 2019 | (21,482) | (24,924)
Income taxes | (402) | (1,127)
Non-cash investing and financing activities: |  |
Receivable from property and equipment insurance | 6,983 |
Net decrease in payables for purchases of property and equipment | (36,894) | (29,935)
Net decrease in deposits on equipment purchases | $ 1,390 | 4,728
Cashless exercise of stock options |  | $ 9,219

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