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	Sep. 30, 2021	Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Leases, gross	$ 159	$ 121
Accumulated amortization	(1,288)	(1,213)
Below market leases	58,655	56,677
Accumulated accretion	(35,357)	(35,219)
Acquired lease intangible liabilities, net	23,298	21,458
Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets, net	31,663	26,328
In-place leases
Acquired Finite-Lived Intangible Assets [Line Items]
Leases, gross	67,215	60,965
Accumulated amortization	(35,711)	(34,758)
Above market leases
Acquired Finite-Lived Intangible Assets [Line Items]
Leases, gross	2,532	5,389
Accumulated amortization	$ (2,373)	$ (5,268)