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Condensed Statements Of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net income $ 141,673 $ 148,098
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 91,252 78,559
(Gain) loss on sale of property and equipment 466 (1,700)
Other operating activities, net 58,840 29,268
Net cash provided by operating activities 292,231 254,225
Cash flows from investing activities:    
Purchase of property and equipment (295,533) (231,253)
Proceeds from sale of property and equipment 2,997 10,351
Net cash used in investing activities (292,536) (220,902)
Cash flows from financing activities:    
Principal payments under long-term debt agreements (26,488) (35,922)
Proceeds From (Repayments Of) Line Of Credit 111,015 23,000
Payments for share repurchases (84,683) (42,399)
Net Change Other Financing Activities (338) 0
Net cash provided by (used in) financing activities (494) (55,321)
(Decrease) increase in cash and cash equivalents (799) (21,998)
Cash and cash equivalents at beginning of period 11,472 34,787
Cash and cash equivalents at end of period $ 10,673 $ 12,789