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Fixed Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fixed assets      
Total fixed assets, gross $ 255,907 $ 200,623  
Less: Accumulated depreciation and amortization (125,075) (117,474)  
Fixed assets, net 130,832 83,149  
Gain on sale of field offices 3,400    
Depreciation and amortization expense 13,400 14,800 $ 15,100
Land, buildings, and building improvements      
Fixed assets      
Total tangible fixed assets, gross 0 7,627  
Leasehold improvements      
Fixed assets      
Total tangible fixed assets, gross 617 1,375  
Software      
Fixed assets      
Software 163,735 129,553  
Equipment      
Fixed assets      
Total tangible fixed assets, gross 15,075 13,858  
Projects in progress      
Fixed assets      
Projects in progress 10,392 21,898  
Construction in progress      
Fixed assets      
Total tangible fixed assets, gross 66,088 26,312  
Capitalized interest included in construction in progress $ 2,100 $ 600