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Fixed Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fixed assets      
Total fixed assets, gross $ 172,300 $ 147,601  
Less: Accumulated depreciation (103,158) (88,514)  
Fixed assets, net 69,142 59,087  
Depreciation and amortization expense 15,100 15,900 $ 15,700
Software      
Fixed assets      
Total fixed assets, gross 124,093 110,405  
Equipment      
Fixed assets      
Total fixed assets, gross 11,771 10,679  
Land, buildings, and building improvements      
Fixed assets      
Total fixed assets, gross 7,627 7,627  
Leasehold improvements      
Fixed assets      
Total fixed assets, gross 1,375 1,171  
Projects in progress      
Fixed assets      
Total fixed assets, gross 17,812 $ 17,719  
Construction in progress      
Fixed assets      
Total fixed assets, gross $ 9,622    
Estimated time to completion of new office building (in years) 3 years