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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net income $ 189,812 $ 152,890
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 251,430 198,964
Provision for bad debts 1,600  
Dry holes and abandonments 85 150
Deferred income tax expense 102,576 70,001
Stock-based compensation expense 11,240 9,850
Tax expense related to stock-based compensation (1,208)  
Net gain on asset disposals (30,732) [1] (2,621) [1]
Changes in operating assets and liabilities:    
Accounts receivable (10,448) (71,416)
Income taxes receivable/payable (4,458) 73,749
Inventory and other assets 6,108 (13,719)
Accounts payable (8,466) 10,649
Accrued expenses (11,262) 11,863
Other liabilities (808) (4,748)
Net cash used in operating activities of discontinued operations   (339)
Net cash provided by operating activities 495,469 435,273
Cash flows from investing activities:    
Purchases of property and equipment (512,065) (427,618)
Proceeds from disposal of assets 58,945 7,474
Net cash provided by investing activities of discontinued operations   25,500
Net cash used in investing activities (453,120) (394,644)
Cash flows from financing activities:    
Purchases of treasury stock (71,337) (4,216)
Dividends paid (15,438) (15,480)
Tax benefit related to stock-based compensation   5,241
Proceeds from senior notes 300,000  
Proceeds from borrowing under revolving credit facility 123,400  
Repayment of borrowing under revolving credit facility (233,400)  
Repayment of other long-term debt (92,500) (2,500)
Debt issuance costs (1,549)  
Proceeds from exercise of stock options 195 13,008
Net cash provided by (used in) financing activities 9,371 (3,947)
Effect of foreign exchange rate changes on cash (367) 290
Net increase in cash and cash equivalents 51,353 36,972
Cash and cash equivalents at beginning of period 23,946 27,612
Cash and cash equivalents at end of period 75,299 64,584
Net cash (paid) received during the period for:    
Interest, net of capitalized interest of $4,065 in 2012 and $4,468 in 2011 (8,153) (6,207)
Income taxes (7,250) 61,351
Supplemental investing and financing information:    
Net increase (decrease) in payables for purchases of property and equipment (8,333) 57,808
Net (increase) decrease in deposits on equipment purchases $ 10,970 $ (15,219)
[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.