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LEASES - Lease Liabilities Classification (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Lease liabilities $ 5,686 $ 446  
Non-current lease liabilities 117,029 3,346  
Total lease liabilities $ 122,715 $ 3,792 $ 4,310