DEFERRED COSTS - Deferred Costs (Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred Costs [Line Items]
Leasing costs, Total Cost	$ 139,207	$ 156,619
Total Cost	145,506	162,918
Leasing costs, Accumulated Amortization	(55,656)	(63,257)
Total, Accumulated Amortization	(60,650)	(67,358)
Leasing costs, Deferred Costs, net	83,551	93,362
Deferred Costs	84,856	95,560
Revolving Credit Facility
Deferred Costs [Line Items]
Financing costs, Total Cost	6,299	6,299
Financing costs, Accumulated Amortization	(4,994)	(4,101)
Financing costs, Deferred Costs, net	$ 1,305	$ 2,198