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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net income (loss) $ (235,828) $ 105,081
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 689,457 $ 538,573
Impairment of goodwill 124,561
Dry holes and abandonments 159 $ 337
Deferred income tax benefit (110,231) (50,830)
Stock-based compensation expense 21,186 19,945
Net gain on asset disposals [1] (7,276) (8,705)
Changes in operating assets and liabilities:    
Accounts receivable 359,304 (143,039)
Income taxes receivable/payable 52,037 13,701
Inventory and other assets 27,579 (6,419)
Accounts payable (120,740) 71,865
Accrued expenses 7,274 22,414
Other liabilities (1,443) 3,410
Net cash provided by operating activities 806,039 566,333
Cash flows from investing activities:    
Purchases of property and equipment and acquisitions (608,220) (773,791)
Proceeds from disposal of assets 15,920 22,499
Net cash used in investing activities (592,300) (751,292)
Cash flows from financing activities:    
Purchases of treasury stock (8,010) (13,554)
Dividends paid (44,064) (43,652)
Tax benefit related to stock-based compensation 458 $ 8,682
Debt issuance costs (1,979)
Proceeds from long-term debt 200,000
Repayment of long-term debt (17,500) $ (7,500)
Proceeds from borrowings under revolving credit facility 54,000
Repayment of borrowings under revolving credit facility $ (357,000)
Proceeds from exercise of stock options $ 30,726
Net cash used in financing activities $ (174,095) (25,298)
Effect of foreign exchange rate changes on cash (6,191) (658)
Net increase (decrease) in cash and cash equivalents 33,453 (210,915)
Cash and cash equivalents at beginning of period 43,012 249,509
Cash and cash equivalents at end of period 76,465 38,594
Net cash (paid) received during the period for:    
Interest, net of capitalized interest of $4,946 in 2015 and $5,268 in 2014 (18,734) (13,678)
Income taxes 63,785 (74,252)
Non-cash investing and financing activities:    
Net (decrease) increase in payables for purchase of property and equipment (95,371) 125,271
Net decrease (increase) in deposits on equipment purchases $ 76,516 $ (59,728)
[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.