INTANGIBLE ASSETS AND LIABILITIES - Summary of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Lease Intangible Assets:
Gross lease intangible assets	$ 161,831	$ 180,215
Accumulated amortization	(30,734)	(13,096)
Lease intangible assets, net	131,097	167,119
Lease Intangible Liabilities:
Below market leases	102,098	102,643
Accumulated amortization	(18,372)	(4,628)
Lease intangible liabilities, net	83,726	98,015
Above market leases
Lease Intangible Assets:
Gross lease intangible assets	61,572	76,443
Tenant origination and absorption costs
Lease Intangible Assets:
Gross lease intangible assets	73,323	76,336
Tenant relationship
Lease Intangible Assets:
Gross lease intangible assets	$ 26,936	$ 27,436