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Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Property and Equipment      
Property and equipment $ 260,904   $ 251,120
Less accumulated depreciation (210,698)   (203,046)
Property and equipment, net 50,206   48,074
Capitalized amount 9,500 $ 7,000  
Amortization expense 6,900 6,700  
Internal use software 41,600   39,000
Computer equipment and software      
Property and Equipment      
Property and equipment 231,231   221,429
Furniture and fixtures      
Property and Equipment      
Property and equipment 10,241   10,238
Leasehold improvements      
Property and Equipment      
Property and equipment 19,432   $ 19,453
Property And Equipment      
Property and Equipment      
Depreciation 8,000 8,000  
Cost of revenue      
Property and Equipment      
Depreciation 7,200 7,100  
Selling, General and Administrative Expenses      
Property and Equipment      
Depreciation $ 800 $ 900