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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net income $ 240,618 $ 234,818
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 393,823 309,677
Provision for bad debts 1,600  
Dry holes and abandonments 117 221
Deferred income tax expense 131,731 110,159
Stock-based compensation expense 17,203 15,366
Tax expense related to stock-based compensation (1,206)  
Net gain on asset disposals (32,695) [1] (4,058) [1]
Changes in operating assets and liabilities:    
Accounts receivable 47,489 (133,371)
Income taxes receivable/payable (3,315) 76,018
Inventory and other assets 8,857 (10,625)
Accounts payable (13,102) 58,020
Accrued expenses (8,030) 6,460
Other liabilities (740) (6,449)
Net cash used in operating activities of discontinued operations   (339)
Net cash provided by operating activities 782,350 655,897
Cash flows from investing activities:    
Purchases of property and equipment (744,348) (711,436)
Proceeds from disposal of assets 63,695 9,054
Net cash provided by investing activities of discontinued operations   25,500
Net cash used in investing activities (680,653) (676,882)
Cash flows from financing activities:    
Purchases of treasury stock (110,186) (4,219)
Dividends paid (22,956) (23,257)
Tax benefit related to stock-based compensation   5,838
Proceeds from senior notes 300,000  
Proceeds from borrowing under revolving credit facility 123,400 15,800
Repayment of borrowing under revolving credit facility (233,400)  
Repayment of other long-term debt (92,500) (3,750)
Debt issuance costs (7,531)  
Proceeds from exercise of stock options 260 14,040
Net cash provided by (used in) financing activities (42,913) 4,452
Effect of foreign exchange rate changes on cash 743 (434)
Net increase in cash and cash equivalents 59,527 (16,967)
Cash and cash equivalents at beginning of period 23,946 27,612
Cash and cash equivalents at end of period 83,473 10,645
Net cash (paid) received during the period for:    
Interest, net of capitalized interest of $6,391 in 2012 and $6,575 in 2011 (7,408) (5,695)
Income taxes (8,120) 60,033
Supplemental investing and financing information:    
Net increase (decrease) in payables for purchases of property and equipment (13,288) 48,106
Net (increase) decrease in deposits on equipment purchases $ 44,762 $ (29,848)
[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.