RIGHT-OF-USE ASSETS UNDER OPERATING LEASES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Right-of-use assets under operating leases	$ 38,685		$ 38,685		$ 39,729
Less: Accumulated amortization	(15,842)		(15,842)		(10,655)
Total	22,843		22,843		$ 29,074	$ 42,100
Amortization of right-of-use assets under operating leases	$ 2,800	$ 3,100	$ 5,500	$ 6,800