RIGHT-OF-USE ASSETS UNDER OPERATING LEASES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Right-of-use assets under operating leases	$ 39,161		$ 39,729
Less: Accumulated amortization	(13,097)		(10,655)
Total	26,064		$ 29,074	$ 42,100
Amortization of right-of-use assets under operating leases	$ 2,706	$ 3,738