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LEASES - Total Lease Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Amortization of right-of-use assets $ 6,737 $ 18,922 $ 30,200
Interest on lease liabilities 522 1,021  
Total finance lease cost 7,259 19,943  
Operating lease, cost 30,870 34,397  
Variable lease cost 8,143 8,551  
Short-term lease cost 313 365  
Sublease income, gross (4,693) (5,045)  
Total lease cost 41,892 $ 58,211  
Rent expense     40,100
Sublease income     $ 6,500
Selling, general and administrative      
Lessee, Lease, Description [Line Items]      
Operating lease, cost 23,100    
Variable lease cost 7,000    
Sublease income, gross (1,200)    
Restructuring and related charges      
Lessee, Lease, Description [Line Items]      
Operating lease, cost 7,800    
Variable lease cost 1,100    
Sublease income, gross $ (3,500)