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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income (loss) $ (294,486) $ 162,664 $ 188,009
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation, depletion, amortization and impairment 864,759 718,730 597,469
Impairment of goodwill 124,561    
Dry holes and abandonments 1,224 550 89
Deferred income tax expense (benefit) (99,873) 43,673 50,569
Stock-based compensation expense 28,510 27,032 25,891
Net gain on asset disposals [1] (10,613) (15,781) (3,384)
Tax expense related to stock-based compensation (1,362)    
Changes in operating assets and liabilities:      
Accounts receivable 440,884 (214,059) 12,007
Income taxes receivable/payable 49,895 (92,352) 4,447
Inventory and other assets 40,238 (5,737) 570
Accounts payable (131,649) 86,621 11,331
Accrued expenses (10,303) 12,838 1,973
Other liabilities (2,348) 4,547 (100)
Net cash provided by operating activities 999,437 728,726 888,871
Cash flows from investing activities:      
Acquisitions   (176,301)  
Purchases of property and equipment (743,776) (1,052,341) (662,461)
Proceeds from disposal of assets 20,814 33,233 10,386
Net cash used in investing activities (722,962) (1,195,409) (652,075)
Cash flows from financing activities:      
Purchases of treasury stock (8,010) (13,554) (73,510)
Dividends paid (58,775) (58,288) (29,112)
Tax benefit related to stock-based compensation   8,729 4,794
Proceeds from long-term debt 200,000    
Repayment of long-term debt (27,500) (10,000) (6,250)
Proceeds from borrowings under revolving credit facility 54,000 349,500  
Repayment of borrowings under revolving credit facility (357,000) (46,500)  
Debt issuance costs (1,979)    
Proceeds from exercise of stock options   30,842 6,959
Net cash provided by (used in) financing activities (199,264) 260,729 (97,119)
Effect of foreign exchange rate changes on cash (6,877) (543) (891)
Net increase (decrease) in cash and cash equivalents 70,334 (206,497) 138,786
Cash and cash equivalents at beginning of year 43,012 249,509 110,723
Cash and cash equivalents at end of year 113,346 43,012 249,509
Net cash (paid) received during the year for:      
Interest, net of capitalized interest of $6,332 in 2015, $6,883 in 2014 and $7,775 in 2013 (33,452) (27,813) (26,228)
Income taxes 97,333 (125,953) (42,600)
Non-cash investing and financing activities:      
Net (decrease) increase in payables for purchases of property and equipment (167,308) 122,148 (26,899)
Net decrease in deposits on equipment purchases $ (90,012) $ (59,819) $ (8,784)
[1] Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.