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Fixed Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fixed assets        
Total fixed assets, gross $ 255,907 $ 360,363 $ 255,907  
Less: Accumulated depreciation and amortization (125,075) (138,984) (125,075)  
Fixed assets, net 130,832 221,379 130,832  
Gain on sale of field offices 3,400   3,400  
Depreciation and amortization expense   16,800 13,400 $ 14,800
Land, buildings, and building improvements        
Fixed assets        
Tangible fixed assets, gross 0 5,068 0  
Leasehold improvements        
Fixed assets        
Tangible fixed assets, gross 617 1,313 617  
Software        
Fixed assets        
Software 163,735 191,709 163,735  
Equipment        
Fixed assets        
Tangible fixed assets, gross 15,075 14,546 15,075  
Furniture, fixtures, and equipment        
Fixed assets        
Tangible fixed assets, gross 0 1,934 0  
Projects in progress        
Fixed assets        
Projects in progress 10,392 22,992 10,392  
Construction in progress        
Fixed assets        
Tangible fixed assets, gross 66,088 122,801 66,088  
Capitalized interest included in construction in progress $ 2,100 $ 3,400 $ 2,100