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Property and Equipment - Schedule (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 510,621 $ 498,540
Accumulated depreciation 300,626 273,103
Net property and equipment 209,995 225,437
Land and improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 47,405 47,405
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 139,685 137,013
Equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 308,873 299,544
Computer software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 14,658 $ 14,578