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, 2020
Mar. 31, 2019
Dec. 31, 2019
Cost:      
Property and equipment, gross $ 130,211   $ 128,104
Less: accumulated depreciation and amortization (77,021)   (74,348)
Total property and equipment, net 53,190   53,756
Depreciation and amortization expense $ 5,317 $ 4,366  
Computer equipment and software      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life 3 years    
Cost:      
Property and equipment, gross $ 72,700   72,190
Leasehold improvements      
Cost:      
Property and equipment, gross 36,180   34,645
Office furniture and fixtures      
Cost:      
Property and equipment, gross $ 10,846   10,832
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 $ 6,898   6,850
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 $ 2,647   2,647
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