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, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 116,649 $ 112,286  
Less accumulated depreciation and amortization (54,588) (47,978)  
Total property and equipment, net 62,061 64,308  
Depreciation and amortization 9,400 9,100 $ 7,900
Buildings and building improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 52,972 51,148  
Computer equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 29,463 27,504  
Furniture, fixtures, equipment and other      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 29,455 27,384  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 545 2,036  
Land and land improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 4,214 $ 4,214