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, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired above market leases, net	$ 670	$ 1,178
Other intangible assets, accumulated amortization	(979)	(1,115)
Below market leases	65,260	67,423
Below market leases, accumulated amortization	(37,808)	(37,241)
Acquired lease intangible liabilities, net	27,452	30,182
Leases, Acquired-in-Place
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired above market leases, net	41,134	54,206
Other intangible assets, accumulated amortization	(34,364)	(45,835)
Above Market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired above market leases, net	11,963	21,262
Other intangible assets, accumulated amortization	(11,293)	(20,084)
Lease Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets, net	$ 7,440	$ 9,549