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Fixed Assets, Net (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Summary of components of fixed assets, net
Fixed assets, net consisted of the following (in thousands):
 December 31,
20202019
Leasehold improvements and other fixed assets$126,428 $119,682 
Software, including software development costs30,928 21,538 
Computer and communications equipment26,168 23,028 
Total, cost183,524 164,248 
Accumulated depreciation and amortization(87,157)(66,232)
Total, net$96,367 $98,016