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LEASES - Operating Lease Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Leases [Abstract]    
Fixed lease costs $ 300 $ 4,818
Short-term lease costs 459 455
Variable lease costs 1,387 1,278
Operating lease expenses $ 2,146 $ 6,551