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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property and Equipment      
Property and equipment $ 266,446 $ 241,610  
Less accumulated depreciation and amortization (130,326) (112,953)  
Property and equipment, net 136,120 128,657  
Depreciation and amortization expense 21,441 20,830 $ 18,393
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 17,161 14,352  
Computer Equipment      
Property and Equipment      
Property and equipment 113,680 100,575  
Furniture, Fixtures and Equipment      
Property and Equipment      
Property and equipment 17,921 15,439  
Internally Developed Software      
Property and Equipment      
Property and equipment 55,083 46,981  
Construction in Progress      
Property and Equipment      
Property and equipment $ 3,381 $ 5,043