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RIGHT-OF-USE ASSETS UNDER OPERATING LEASES, NET (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Leases [Abstract]      
Right-of-use assets under operating leases $ 30,111   $ 31,932
Less: Accumulated amortization (13,810)   (13,719)
Total 16,301   $ 18,213
Amortization of right-of-use assets under operating leases $ 1,927 $ 2,706