RIGHT-OF-USE ASSETS UNDER OPERATING LEASES, NET (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Leases [Abstract]
Right-of-use assets under operating leases	$ 25,793		$ 25,793		$ 31,932
Less: Accumulated amortization	(13,506)		(13,506)		(13,719)
Total	12,287		12,287		$ 18,213
Amortization of right-of-use assets under operating leases	$ 2,600	$ 2,800	$ 4,513	$ 5,474