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Fixed Assets, Net (Tables)
9 Months Ended
Sep. 30, 2024
Property, Plant and Equipment [Abstract]  
Schedule of Components of Fixed Assets, Net
Fixed assets, net consisted of the following (in thousands):
September 30, 2024December 31, 2023
Leasehold improvements, furniture and fixtures, and other fixed assets$258,089 $245,262 
Software, including software development costs62,673 56,883 
Computer and communications equipment40,122 37,693 
Total, cost360,884 339,838 
Accumulated depreciation and amortization(187,611)(161,803)
Total, net$173,273 $178,035