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, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired above market leases, net	$ 1,408	$ 2,088
Other intangible assets, accumulated amortization	(1,102)	(1,128)
Below market leases	67,423	66,521
Below market leases, accumulated amortization	(36,252)	(33,073)
Acquired lease intangible liabilities, net	31,171	33,448
Leases, Acquired-in-Place
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired above market leases, net	54,206	48,741
Other intangible assets, accumulated amortization	(45,154)	(38,906)
Above Market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired above market leases, net	21,262	21,667
Other intangible assets, accumulated amortization	(19,854)	(19,579)
Lease Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets, net	$ 10,460	$ 11,923