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Property Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]      
Furniture and equipment $ 522,036 $ 409,076  
Transportation equipment 11,854 11,807  
Building and leasehold improvements 274,118 294,221  
Land and land improvements 6,747 6,747  
Construction in progress 23,774 91,536  
Property assets 838,529 813,387  
Accumulated depreciation (522,101) (482,448)  
Property assets, net of accumulated depreciation 316,428 330,939  
Capitalized software costs included in construction in progress 22,900 70,300  
Cost of internally developed software placed in service $ 84,500 $ 22,900 $ 51,600