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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Estimated Useful Lives of Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Capitalized software, leasehold improvements and equipment, net:    
Property and equipment, net $ 108,842 $ 103,361
Capitalized software and computer equipment | Minimum    
Capitalized software, leasehold improvements and equipment, net:    
Estimated useful life (in years) 2 years  
Capitalized software and computer equipment | Maximum    
Capitalized software, leasehold improvements and equipment, net:    
Estimated useful life (in years) 3 years  
Furniture and other equipment | Minimum    
Capitalized software, leasehold improvements and equipment, net:    
Estimated useful life (in years) 5 years  
Furniture and other equipment | Maximum    
Capitalized software, leasehold improvements and equipment, net:    
Estimated useful life (in years) 7 years  
Leasehold improvements | Minimum    
Capitalized software, leasehold improvements and equipment, net:    
Estimated useful life (in years) 5 years  
Leasehold improvements | Maximum    
Capitalized software, leasehold improvements and equipment, net:    
Estimated useful life (in years) 25 years  
Capitalized internal use software    
Capitalized software, leasehold improvements and equipment, net:    
Property and equipment, net $ 67,900 $ 56,300