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LEASE - Total leases - Gross difference (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
LEASE    
Total future minimum lease payments $ 54,123  
Less: imputed interest 1,430  
NPV for future minimum lease payments $ 52,693 $ 78,559
Total future minimum lease payments   82,851
Less: imputed interest   4,292
NPV for future minimum lease payments   $ 78,559