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LEASES - Components of Lease Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases      
Operating lease expense $ 24,559 $ 22,291  
Variable lease expense 3,152 3,366  
Sublease income (398) (324)  
Total operating lease expense $ 27,313 $ 25,333  
Rental expense for operating leases     $ 20,500