RIGHT-OF-USE ASSETS UNDER OPERATING LEASES, NET (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Leases [Abstract]
Right-of-use assets under operating leases	$ 31,932,000	$ 39,729,000
Less: Accumulated amortization	(13,719,000)	(10,655,000)
Total	18,213,000	29,074,000		$ 42,100,000
Amortization of right-of-use assets under operating leases	$ 10,245,000	$ 11,769,000	$ 0