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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income $ 56,230 $ 97,274
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 136,435 122,953
Provision for bad debts   1,600
Dry holes and abandonments 10 56
Deferred income tax expense 24,555 48,407
Stock-based compensation expense 5,903 5,458
Net (gain) loss on asset disposals 125 [1] (2,400) [1]
Changes in operating assets and liabilities:    
Accounts receivable (25,220) (38,109)
Income taxes receivable/payable 1,267 5,807
Inventory and other assets 6,672 5,332
Accounts payable 21,385 30,418
Accrued expenses (17,698) (12,234)
Other liabilities 53 (897)
Net cash provided by operating activities 209,717 263,665
Cash flows from investing activities:    
Purchase of property and equipment (174,161) (263,403)
Proceeds from disposal of assets 707 4,651
Net cash used in investing activities (173,454) (258,752)
Cash flows from financing activities:    
Purchase of treasury stock (15,201) (15)
Dividends paid (7,312) (7,788)
Tax benefit related to stock-based compensation 2,737 166
Repayment of long-term debt (1,250) (2,500)
Proceeds from borrowing under revolving credit facility   54,500
Repayment of borrowing under revolving credit facility   (56,000)
Proceeds from exercise of stock options 18,622 195
Net cash used in financing activities (2,404) (11,442)
Effect of foreign exchange rate changes on cash (551) 408
Net increase (decrease) in cash and cash equivalents 33,308 (6,121)
Cash and cash equivalents at beginning of period 110,723 23,946
Cash and cash equivalents at end of period 144,031 17,825
Net cash paid during the period for:    
Interest, net of capitalized interest of $2,281 in 2013 and $1,968 in 2012   (364)
Income taxes (3,543) (1,390)
Supplemental investing and financing information:    
Net increase in current liabilities for purchase of property and equipment 24,039 2,553
Net decrease in deposits on equipment purchases $ 7,863 $ 1,900
[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.