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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