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Condensed Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net income $ 31,095 $ 21,573
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 25,544 21,121
Loss on sale of property and equipment (474) (517)
Deferred income taxes (13,743) (4,646)
Other operating activities, net (34,957) (35,242)
Net cash provided by operating activities 78,327 73,807
Cash flows from investing activities:    
Purchase of property and equipment (89,393) (58,450)
Proceeds from sale of property and equipment 628 1,237
Net cash used in investing activities (88,765) (57,213)
Cash flows from financing activities:    
Proceeds from issuance of long-term debt 6 95,000
Principal payments under long-term debt agreements (11,199) (11,071)
Net payments on revolving line of credit 0 (66,230)
Proceeds from stock issuance, net of issuance costs 0 48,400
Net cash provided by (used in) financing activities (11,193) 66,099
(Decrease) increase in cash and cash equivalents (21,631) 82,693
Cash and cash equivalents at beginning of period 75,850 5,450
Cash and cash equivalents at end of period 54,219 88,143
Supplemental disclosure of noncash investing activities:    
Acquisition of property and equipment by capital lease $ 211 $ 0