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Condensed Statements Of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income $ 65,792 $ 60,285
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 50,287 44,772
(Gain) loss on sale of property and equipment 77 200
Share-based compensation 710 0
Other operating activities, net (6,057) 63,136
Net cash provided by operating activities 110,809 168,393
Cash flows from investing activities:    
Purchase of property and equipment (56,997) (120,294)
Proceeds from sale of property and equipment 1,828 691
Net cash used in investing activities (55,169) (119,603)
Cash flows from financing activities:    
Principal payments under long-term debt agreements 0 (892)
Proceeds From (Repayments Of) Line Of Credit (9,975) (7,591)
Payments for share repurchases (50) (44,646)
Dividends paid (8,235) 0
Net cash provided by (used in) financing activities (18,260) (53,129)
(Decrease) increase in cash and cash equivalents 37,380 (4,339)
Cash and cash equivalents at beginning of period 10,171 11,472
Cash and cash equivalents at end of period $ 47,551 $ 7,133