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Fixed Assets, Net (Tables)
3 Months Ended
Mar. 31, 2020
Property, Plant and Equipment [Abstract]  
Components of Fixed Assets, Net

Fixed assets, net consisted of the following (in thousands):
 
March 31,
2020
 
December 31,
2019
Leasehold improvements and other fixed assets
$
125,601

 
$
119,682

Software, including software development costs
28,376

 
28,063

Computer and communications equipment
24,330

 
23,028

Total, cost
178,307

 
170,773

Accumulated depreciation and amortization
(75,246
)
 
(72,757
)
Total, net
$
103,061

 
$
98,016