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Fixed Assets, Net (Tables)
9 Months Ended
Sep. 30, 2023
Property, Plant and Equipment [Abstract]  
Summary of Components of Fixed Assets, Net
Fixed assets, net consisted of the following (in thousands):
September 30, 2023December 31, 2022
Leasehold improvements, furniture and fixtures, and other fixed assets$237,635 $207,020 
Software, including software development costs55,814 48,112 
Computer and communications equipment36,739 31,586 
Total, cost330,188 286,718 
Accumulated depreciation and amortization(153,354)(131,079)
Total, net$176,834 $155,639