ACQUIRED IN-PLACE LEASES AND ABOVE/BELOW MARKET LEASES Acquired Lease Intangibles and Leasing Costs Included in Other Assets and Other Liabilities and Deferred Credits (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired above market leases, net	$ 376	$ 518
Other intangible assets, accumulated amortization	(1,025)	(981)
Below market leases	63,172	63,172
Below market leases, accumulated amortization	(38,288)	(37,220)
Acquired lease intangible liabilities, net	24,884	25,952
Leases, Acquired-in-Place
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired above market leases, net	40,884	40,884
Other intangible assets, accumulated amortization	(35,058)	(34,603)
Above Market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired above market leases, net	11,963	11,963
Other intangible assets, accumulated amortization	(11,587)	(11,445)
Lease Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets, net	$ 6,202	$ 6,799