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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income (loss) $ (9,850) $ 89,105
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 357,306 300,748
Dry holes and abandonments 114 321
Deferred income tax benefit (40,225) (9,768)
Stock-based compensation expense 13,831 12,959
Net gain on asset disposals [1] (5,914) (4,835)
Changes in operating assets and liabilities:    
Accounts receivable 330,176 (56,963)
Income taxes receivable/payable 93,527 (13,473)
Inventory and other assets 12,077 (21,896)
Accounts payable (108,424) 50,012
Accrued expenses (1,894) 12,122
Other liabilities (63) 1,847
Net cash provided by operating activities 640,661 360,179
Cash flows from investing activities:    
Purchases of property and equipment and acquisitions (463,633) (488,038)
Proceeds from disposal of assets 10,728 14,991
Net cash used in investing activities (452,905) (473,047)
Cash flows from financing activities:    
Purchases of treasury stock (8,010) (13,554)
Dividends paid (29,352) (29,018)
Tax benefit related to stock-based compensation 1,129 8,556
Debt issuance costs (1,979)  
Proceeds from long-term debt 200,000  
Repayment of long-term debt (10,000) (5,000)
Proceeds from borrowings under revolving credit facility 54,000  
Repayment of borrowings under revolving credit facility (357,000)  
Proceeds from exercise of stock options   22,265
Net cash used in financing activities (151,212) (16,751)
Effect of foreign exchange rate changes on cash (3,050) 947
Net increase (decrease) in cash and cash equivalents 33,494 (128,672)
Cash and cash equivalents at beginning of period 43,012 249,509
Cash and cash equivalents at end of period 76,506 120,837
Net cash (paid) received during the period for:    
Interest, net of capitalized interest of $3,343 in 2015 and $3,326 in 2014 (16,506) (13,360)
Income taxes 63,740 (54,089)
Non-cash investing and financing activities:    
Net (decrease) increase in payables for purchase of property and equipment (50,487) 96,143
Net decrease (increase) in deposits on equipment purchases $ 64,638 $ (25,558)
[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.