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Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost $ 107,419 $ 97,256
Less: Accumulated depreciation (76,316) (68,842)
Total property and equipment and finance lease right-of-use assets, net 31,103 28,414
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost 2,811 2,811
Building and improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost 34,630 33,094
Computer equipment and software    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost 50,295 44,369
Furniture, fixtures, and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost 15,545 12,849
Aircraft    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost 4,075 4,075
Other    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost $ 63 $ 58