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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss $ (120,172) $ (189,492)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 703,928 572,187
Dry holes and abandonments 569 443
Deferred income tax benefit (24,617) (104,190)
Stock-based compensation expense 28,449 35,101
Net gain on asset disposals (21,186) (19,079)
Amortization of debt discount and issuance costs 607 260
Changes in operating assets and liabilities:    
Accounts receivable (67,975) (246,407)
Income taxes receivable 3,275 1,499
Inventory and other assets (8,022) (26,398)
Accounts payable (31,935) 91,499
Accrued expenses 25,480 15,917
Other liabilities 345 (75)
Net cash provided by operating activities 488,746 131,265
Cash flows from investing activities:    
Acquisitions, net of cash acquired (3,800) (434,194)
Purchases of property and equipment (480,568) (329,851)
Proceeds from disposal of assets 28,008 39,672
Collection of note receivable 23,760  
Other investments   (2,520)
Net cash used in investing activities (432,600) (726,893)
Cash flows from financing activities:    
Proceeds of equity offering   471,570
Purchases of treasury stock (111,655) (6,809)
Proceeds from exercise of options 485  
Dividends paid (21,960) (11,866)
Debt issuance costs (4,469)  
Proceeds from long-term debt 521,194  
Proceeds from borrowings under revolving credit facility 79,000 282,000
Repayment of borrowings under revolving credit facility (347,000) (138,000)
Net cash provided by financing activities 115,595 596,895
Effect of foreign exchange rate changes on cash (537) 1,420
Net increase in cash and cash equivalents 171,204 2,687
Cash and cash equivalents at beginning of period 42,828 35,152
Cash and cash equivalents at end of period 214,032 37,839
Net cash (paid) received during the period for:    
Interest, net of capitalized interest of $1,094 in 2018 and $781 in 2017 (27,306) (18,336)
Income taxes 3,277 3,866
Non-cash investing and financing activities:    
Receivable from property and equipment insurance 15,000  
Net increase in payables for purchases of property and equipment 60,545 48,919
Issuance of common stock for business acquisitions   1,039,396
Net (increase) decrease in deposits on equipment purchases $ (2,707) $ 1,023