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Property And Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Total property and equipment $ 816,112 $ 810,079  
Accumulated depreciation (403,104) (379,869)  
Property and equipment — net 413,008 430,210 $ 399,445
Land [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment 9,992 9,864  
Building and Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment 5,133 5,896  
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment 11,998 10,587  
Operating Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment $ 788,989 $ 783,732