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Condensed Statements Of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income $ 227,254 $ 232,466
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 140,293 121,120
(Gain) loss on sale of property and equipment 542 (2,177)
Other operating activities, net 42,039 20,865
Net cash provided by operating activities 410,128 372,274
Cash flows from investing activities:    
Purchase of property and equipment (351,121) (362,015)
Proceeds from sale of property and equipment 4,571 19,372
Net cash used in investing activities (346,550) (342,643)
Cash flows from financing activities:    
Principal payments under long-term debt agreements (26,488) (36,889)
Proceeds From (Repayments Of) Line Of Credit 85,812 63,000
Payments for share repurchases (119,022) (79,117)
Net Change Other Financing Activities (338) 0
Net cash provided by (used in) financing activities (60,036) (53,006)
(Decrease) increase in cash and cash equivalents 3,542 (23,375)
Cash and cash equivalents at beginning of period 11,472 34,787
Cash and cash equivalents at end of period $ 15,014 $ 11,412