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