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Property, Equipment and Capitalized Software, Net - Schedule Of Property, Equipment And Capitalized Software, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Property, equipment and capitalized software, gross $ 590,746 $ 556,687  
Less: accumulated depreciation (402,406) (344,212)  
Total property, equipment and capitalized software, net 188,340 212,475 $ 187,868
Furniture, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Property, equipment and capitalized software, gross 87,111 94,478  
Computer software, including internal-use software      
Property, Plant and Equipment [Line Items]      
Property, equipment and capitalized software, gross 463,614 411,308  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property, equipment and capitalized software, gross 32,111 32,406  
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property, equipment and capitalized software, gross $ 7,910 $ 18,495