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PROPERTY AND EQUIPMENT, NET
 9 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
PROPERTY AND EQUIPMENT, NET PROPERTY AND EQUIPMENT, NET
The following is a summary of property and equipment, less accumulated depreciation and amortization (in thousands):    
  September 30, 2021December 31, 2020
Leasehold improvements$202,430 $168,125 
Computer equipment161,880 139,174 
Capitalized software107,200 119,452 
Office furniture and equipment41,131 34,890 
Total512,641 461,641 
Less: Accumulated depreciation and amortization(237,355)(228,121)
Property and equipment, net$275,286 $233,520 

Depreciation and amortization expense on property and equipment was $27.0 million and $15.4 million for the three months ended September 30, 2021 and 2020 respectively, and $68.4 million and $48.2 million for the nine months ended September 30, 2021 and 2020, respectively.