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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Total Cost $ 71,116 $ 60,671  
Less: Accumulated depreciation (31,621) (31,533)  
Property and equipment, net of accumulated depreciation 39,495 29,138  
Depreciation expense 6,800 5,600 $ 5,300
Computers and equipment      
Property, Plant and Equipment [Line Items]      
Total Cost $ 7,105 8,000  
Property, Plant and Equipment, Useful Life 5 years    
Computer software      
Property, Plant and Equipment [Line Items]      
Total Cost $ 4,112 4,554  
Property, Plant and Equipment, Useful Life 3 years    
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Total Cost $ 11,780 10,566  
Property, Plant and Equipment, Useful Life 7 years    
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Total Cost $ 48,119 $ 37,551  
Leasehold improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 14 years    
Leasehold improvements | Minimum      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years