Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment, Net (Details)

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Property and Equipment, Net (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Cost:      
Property and equipment, gross $ 137,748   $ 132,123
Less: accumulated depreciation and amortization (86,671)   (84,154)
Total property and equipment, net 51,077   47,969
Depreciation and amortization expense $ 5,643 $ 5,317  
Computer equipment and software      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life 3 years    
Cost:      
Property and equipment, gross $ 73,176   72,443
Leasehold improvements      
Cost:      
Property and equipment, gross 41,925   37,671
Office furniture and fixtures      
Cost:      
Property and equipment, gross $ 12,180   11,249
Office furniture and fixtures | Minimum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life 3 years    
Office furniture and fixtures | Maximum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life 7 years    
Office equipment and other      
Cost:      
Property and equipment, gross $ 6,858   7,151
Office equipment and other | Minimum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life 3 years    
Office equipment and other | Maximum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life 5 years    
Building and building improvements      
Cost:      
Property and equipment, gross $ 2,669   2,669
Building and building improvements | Minimum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life 7 years    
Building and building improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life 39 years    
Land      
Cost:      
Property and equipment, gross $ 940   $ 940