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Fixed Assets, Net (Tables)
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Components of Fixed Assets, Net Fixed assets, net consisted of the following (in thousands):
December 31, 2021December 31, 2020
Computer and communications equipment$96,472 $92,577 
Software, including software development costs280,540 265,082 
Leasehold improvements and other fixed assets105,362 121,024 
482,374 478,683 
Less: accumulated depreciation and amortization(292,262)(262,659)
Fixed assets, net$190,112 $216,024