Annual report pursuant to Section 13 and 15(d)

Property and Equipment (Details)

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Property and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 116,535 $ 116,649  
Less accumulated depreciation and amortization (61,389) (54,588)  
Total property and equipment, net 55,146 62,061  
Depreciation and amortization 9,300 9,400 $ 9,100
Buildings and building improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 53,049 52,972  
Computer equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 27,775 29,463  
Furniture, fixtures, equipment and other      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 30,704 29,455  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 545 545  
Land and land improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 4,462 $ 4,214