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Condensed Statements Of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income $ 148,098 $ 119,736
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 78,559 69,213
(Gain) loss on sale of property and equipment (1,700) (2,396)
Deferred income taxes (14,451) (14,475)
Other operating activities, net 43,719 9,595
Net cash provided by operating activities 254,225 181,673
Cash flows from investing activities:    
Purchase of property and equipment (231,253) (218,568)
Proceeds from sale of property and equipment 10,351 18,225
Net cash used in investing activities (220,902) (200,343)
Cash flows from financing activities:    
Principal payments under long-term debt agreements (35,922) (35,715)
Proceeds From (Repayments Of) Line Of Credit 23,000 44,000
Payments for share repurchases (42,399) 0
Net cash provided by (used in) financing activities (55,321) 8,285
(Decrease) increase in cash and cash equivalents (21,998) (10,385)
Cash and cash equivalents at beginning of period 34,787 30,174
Cash and cash equivalents at end of period $ 12,789 $ 19,789