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Fixed Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fixed assets      
Total fixed assets, gross $ 200,623 $ 172,300  
Less: Accumulated depreciation (117,474) (103,158)  
Fixed assets, net 83,149 69,142  
Depreciation and amortization expense 14,800 15,100 $ 15,900
Software      
Fixed assets      
Total fixed assets, gross 129,553 124,093  
Equipment      
Fixed assets      
Total fixed assets, gross 13,858 11,771  
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 1,375  
Projects in progress      
Fixed assets      
Total fixed assets, gross 21,898 17,812  
Construction in progress      
Fixed assets      
Total fixed assets, gross 26,312 9,622  
Capitalized interest included in construction in progress $ 600 $ 0  
Estimated time to completion of new office building (in years) 3 years