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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Total $ 27,960 $ 27,729  
Accumulated depreciation (16,125) (16,275)  
Property and equipment, net 11,835 11,454  
Depreciation expense 2,900 2,100 $ 2,300
Office equipment and software      
Property, Plant and Equipment [Line Items]      
Total 13,540 14,595  
Leasehold Improvements      
Property, Plant and Equipment [Line Items]      
Total 10,593 9,417  
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Total $ 3,827 $ 3,717