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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income $ 102,757 $ 80,039 $ 56,584
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 158,634 152,242 155,315
Deferred income taxes 57,863 (11,921) 4,908
Gain on disposal of operating equipment (21,290) (5,907) (3,192)
Stock-based compensation 2,599 1,461 1,243
Insurance and claims accruals, net of current portion 8,000 (250) (7,000)
Other (1,073) 592 (1,160)
Changes in certain working capital items:      
Accounts receivable, net (28,448) (9,524) 5,196
Prepaid expenses and other current assets (21,744) (1,218) 7,535
Accounts payable 19,381 10,839 (445)
Accrued and other current liabilities (12,199) 12,130 (24,542)
Net cash provided by operating activities 264,480 228,483 194,442
Cash flows from investing activities:      
Additions to property and equipment (302,340) (176,057) (177,846)
Retirements of property and equipment 70,142 57,024 79,000
Decrease in notes receivable 7,354 4,699 4,286
Net cash used in investing activities (224,844) (114,334) (94,560)
Cash flows from financing activities:      
Proceeds from issuance of short-term debt 50,000 50,000 20,000
Repayments of short-term debt (50,000) (50,000) (50,000)
Change in net checks issued in excess of cash balances 6,671 0 0
Dividends on common stock (50,969) (130,676) (104,189)
Stock options exercised 2,940 7,980 2,577
Excess tax benefits from exercise of stock options 605 3,422 1,331
Net cash used in financing activities (40,753) (119,274) (130,281)
Effect of exchange rate fluctuations on cash (437) 661 205
Net decrease in cash and cash equivalents (1,554) (4,464) (30,194)
Cash and cash equivalents, beginning of year 13,966 18,430 48,624
Cash and cash equivalents, end of year 12,412 13,966 18,430
Supplemental disclosures of cash flow information:      
Interest paid 85 47 154
Income taxes paid 28,802 56,050 34,431
Supplemental disclosures of non-cash investing activities:      
Notes receivable issued upon sale of property and equipment 9,172 4,607 2,136
Property and equipment acquired included in accounts payable 17,026 629 816
Property and equipment disposed included in other receivables $ 258 $ 573 $ 839