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Condensed Statements Of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net income $ 232,466 $ 197,645
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 121,120 106,920
(Gain) loss on sale of property and equipment (2,177) (2,300)
Deferred income taxes (9,288) (7,150)
Other operating activities, net 30,153 (17,100)
Net cash provided by operating activities 372,274 278,015
Cash flows from investing activities:    
Purchase of property and equipment (362,015) (311,993)
Proceeds from sale of property and equipment 19,372 19,485
Net cash used in investing activities (342,643) (292,508)
Cash flows from financing activities:    
Principal payments under long-term debt agreements (36,889) (35,715)
Proceeds From (Repayments Of) Line Of Credit 63,000 28,203
Payments for share repurchases (79,117) 0
Net cash provided by (used in) financing activities (53,006) (7,512)
(Decrease) increase in cash and cash equivalents (23,375) (22,005)
Cash and cash equivalents at beginning of period 34,787 30,174
Cash and cash equivalents at end of period $ 11,412 $ 8,169