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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net loss $ (78,061) $ (45,130)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 423,098 422,276
Dry holes and abandonments 94 562
Deferred income tax benefit (14,867) (8,100)
Stock-based compensation expense 20,388 19,272
Net gain on asset disposals (10,516) (17,472)
Writedown of capacity reservation contract 12,673  
Provision for bad debts 3,594  
Amortization of debt discount and issuance costs 443 387
Changes in operating assets and liabilities:    
Accounts receivable 54,188 (22,363)
Income taxes receivable/payable (2,972) (22)
Inventory and other assets (3,967) (25,277)
Accounts payable (16,941) (23,432)
Accrued liabilities (18,884) (542)
Other liabilities (2,971) 76
Net cash provided by operating activities 365,299 300,235
Cash flows from investing activities:    
Acquisitions, net of cash acquired (13) (3,800)
Purchases of property and equipment (215,260) (317,783)
Proceeds from disposal of assets and insurance claims 31,516 21,005
Collection of note receivable   23,760
Net cash used in investing activities (183,757) (276,818)
Cash flows from financing activities:    
Purchases of treasury stock (154,152) (59,879)
Proceeds from exercise of options   485
Dividends paid (16,843) (13,275)
Debt issuance costs   (4,333)
Proceeds from long-term debt   521,194
Proceeds from borrowings under revolving credit facility   79,000
Repayment of borrowings under revolving credit facility   (347,000)
Net cash provided by financing activities (170,995) 176,192
Effect of foreign exchange rate changes on cash (62) (529)
Net increase in cash and cash equivalents 10,485 199,080
Cash and cash equivalents at beginning of period 245,029 42,828
Cash and cash equivalents at end of period 255,514 241,908
Net cash (paid) received during the period for:    
Interest, net of capitalized interest of $380 in 2019 and $722 in 2018 (24,924) (15,573)
Income taxes (1,127) 21
Non-cash investing and financing activities:    
Receivable from property and equipment insurance   15,000
Net increase (decrease) in payables for purchases of property and equipment (29,935) 75,032
Net (increase) decrease in deposits on equipment purchases 4,728 $ (5,419)
Cashless exercise of stock options $ 9,219