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Business and Significant Accounting Policies - Property, Equipment and Leasehold Improvements, Less Accumulated Depreciation and Amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Property, equipment and leasehold improvements, gross $ 648,839 $ 616,892
Less — accumulated depreciation and amortization (405,871) (354,174)
Property, equipment and leasehold improvements, net 242,968 262,718
Computer equipment and software    
Property, Plant and Equipment [Line Items]    
Property, equipment and leasehold improvements, gross $ 387,362 320,136
Computer equipment and software | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Life 2 years  
Computer equipment and software | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Life 7 years  
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and leasehold improvements, gross $ 71,026 83,551
Furniture and equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Life 3 years  
Furniture and equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Life 8 years  
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, equipment and leasehold improvements, gross $ 190,451 $ 213,205
Leasehold improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Life 2 years  
Leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Life 15 years