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LEASES - Components of operating lease cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
LEASES    
Operating lease cost $ 22,920 $ 11,052
Short-term and variable lease cost 1,895 4,726
Total operating lease costs $ 24,815 $ 15,778