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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income (loss) $ 5,910 $ (318,634) $ (294,486)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation, depletion, amortization and impairment 783,341 668,434 864,759
Impairment of goodwill     124,561
Dry holes and abandonments 1,929 58 1,224
Deferred income tax benefit (330,346) (152,160) (99,873)
Stock-based compensation expense 44,483 28,324 28,510
Net gain on asset disposals (33,510) (14,771) (10,613)
Tax expense related to stock-based compensation   (4,868) (1,362)
Amortization of debt issuance costs 346 2,270 1,245
Changes in operating assets and liabilities:      
Accounts receivable (239,482) 72,327 440,884
Income taxes receivable/payable 990 30,379 49,895
Inventory and other assets (23,449) 5,664 38,993
Accounts payable 104,072 12,024 (131,649)
Accrued expenses (14,190) (24,573) (10,303)
Other liabilities 617 560 (2,348)
Net cash provided by operating activities 300,711 305,034 999,437
Cash flows from investing activities:      
Acquisitions, net of cash acquired (501,954) 155  
Purchases of property and equipment (567,087) (119,799) (743,776)
Proceeds from disposal of assets 60,945 21,889 20,814
Other investments (2,520)    
Net cash used in investing activities (1,010,616) (97,755) (722,962)
Cash flows from financing activities:      
Proceeds from equity offering 471,570    
Purchases of treasury stock (6,809) (3,610) (8,010)
Dividends paid (16,315) (23,579) (58,775)
Proceeds from long-term debt     200,000
Repayment of long-term debt   (255,000) (27,500)
Proceeds from borrowings under revolving credit facility 599,000 200,500 54,000
Repayment of borrowings under revolving credit facility (331,000) (200,500) (357,000)
Debt issuance costs   (3,357) (1,979)
Proceeds from exercise of stock options 123 268  
Net cash provided by (used in) financing activities 716,569 (285,278) (199,264)
Effect of foreign exchange rate changes on cash 1,012 (195) (6,877)
Net increase (decrease) in cash and cash equivalents 7,676 (78,194) 70,334
Cash and cash equivalents at beginning of year 35,152 113,346 43,012
Cash and cash equivalents at end of year 42,828 35,152 113,346
Net cash (paid) received during the year for:      
Interest, net of capitalized interest of $1,175 in 2017, $398 in 2016 and $6,332 in 2015 (34,953) (36,551) (33,452)
Income taxes 3,947 52,716 97,333
Non-cash investing and financing activities:      
Net increase (decrease) in payables for purchases of property and equipment 17,228 28,926 (167,308)
Issuance of common stock for business acquisition 1,226,890 6,733  
Net decrease (increase) in deposits on equipment purchases $ (301) $ 6,317 $ 90,012