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Statements Of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income $ 206,113,000 $ 169,452,000 $ 139,470,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 127,072,000 110,743,000 90,820,000
(Gain) loss on sale of property and equipment (5,743,000) 78,000 1,263,000
Deferred income taxes 32,736,000 17,682,000 43,348,000
Changes in assets and liabilities      
Customer and other receivables, net (30,063,000) (5,410,000) (40,414,000)
Prepaid expenses and other assets 1,910,000 (7,956,000) (2,952,000)
Accounts payable (8,103,000) 2,795,000 12,875,000
Compensation, benefits and other accrued liabilities 17,714,000 13,559,000 17,626,000
Claims and insurance accruals 6,952,000 7,458,000 6,696,000
Income taxes, net (12,027,000) 9,264,000 3,224,000
Other liabilities 14,105,000 10,391,000 5,978,000
Net cash provided by operating activities 350,666,000 328,056,000 277,934,000
Cash flows from investing activities:      
Purchase of property and equipment (295,606,000) (373,193,000) (250,768,000)
Proceeds from sale of property and equipment 11,235,000 12,018,000 5,436,000
Net cash used in investing activities (284,371,000) (361,175,000) (245,332,000)
Cash flows from financing activities:      
Proceeds from issuance of long-term debt 0 412,000 96,010,000
Principal payments under long-term debt agreements (38,978,000) (40,284,000) (40,382,000)
Net (payments) proceeds on revolving line of credit (10,000,000) 10,000,000 (66,230,000)
Proceeds from stock issuance, net of issuance costs 0 0 48,400,000
Other financing activities, net 0 (2,000) 0
Net cash (used in) provided by financing activities (48,978,000) (29,874,000) 37,798,000
(Decrease) increase in cash and cash equivalents 17,317,000 (62,993,000) 70,400,000
Cash and cash equivalents at beginning of year 12,857,000 75,850,000 5,450,000
Cash and cash equivalents at end of year 30,174,000 12,857,000 75,850,000
Income taxes paid 102,448,000 74,932,000 34,579,000
Interest paid 11,585,000 13,728,000 14,011,000
Capitalized interest $ 1,731,000 $ 1,963,000 $ 895,000