LEASES - Lessee Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lessee operating leases
Contractual ground lease expense	$ 100	$ 100	$ 300	$ 300
Variable lease expense		100	100	300
Operating lease right-of-use asset amortization			2,500	600
Operating lease liabilities amortization			2,200	300
Ground Leases
Lessee operating leases
Contractual ground lease expense	3,217	1,954	9,603	6,232
Variable lease expense	33	187	120	469
Ground Leases | Other operating expense
Lessee operating leases
Total lease expense	$ 3,250	$ 2,141	$ 9,723	$ 6,701