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Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment and finance lease right-of-use assets at cost $ 97,256 $ 98,484
Less: Accumulated depreciation (68,842) (68,852)
Total property and equipment and finance lease right-of-use assets, net 28,414 29,632
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment and finance lease right-of-use assets at cost 2,811 2,811
Building and improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment and finance lease right-of-use assets at cost 33,094 31,619
Computer equipment and software    
Property, Plant and Equipment [Line Items]    
Property and equipment and finance lease right-of-use assets at cost 44,369 47,472
Furniture, fixtures, and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment and finance lease right-of-use assets at cost 12,849 12,593
Aircraft    
Property, Plant and Equipment [Line Items]    
Property and equipment and finance lease right-of-use assets at cost 4,075 3,910
Other    
Property, Plant and Equipment [Line Items]    
Property and equipment and finance lease right-of-use assets at cost $ 58 $ 79