LEASES - Lessee Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Lessee operating leases
Contractual ground lease expense	$ 100	$ 100
Variable lease expense	100	200
Operating lease right-of-use asset amortization	800	200
Operating lease liabilities amortization	700	100
Ground Leases
Lessee operating leases
Contractual ground lease expense	3,170	2,159
Variable lease expense	43	139
Ground Leases | Other operating expense
Lessee operating leases
Total lease expense	$ 3,213	$ 2,298