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Property and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Property and Equipment    
Property and equipment $ 259,712 $ 241,610
Less accumulated depreciation and amortization (125,204) (112,953)
Property and equipment, net 134,508 128,657
Land    
Property and Equipment    
Property and equipment 5,579 5,579
Land Improvements    
Property and Equipment    
Property and equipment 2,242 2,242
Buildings    
Property and Equipment    
Property and equipment 51,399 51,399
Buildings and Leasehold Improvements    
Property and Equipment    
Property and equipment 17,027 14,352
Computer Equipment    
Property and Equipment    
Property and equipment 110,185 100,575
Furniture, Fixtures and Equipment    
Property and Equipment    
Property and equipment 17,075 15,439
Internally Developed Software    
Property and Equipment    
Property and equipment 50,485 46,981
Construction in Progress    
Property and Equipment    
Property and equipment $ 5,720 $ 5,043