INTANGIBLE ASSETS AND LIABILITIES - Summary of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Lease Intangible Assets:
Gross lease intangible assets	$ 139,424	$ 161,831
Accumulated amortization	(37,915)	(30,734)
Lease intangible assets, net	101,509	131,097
Lease Intangible Liabilities:
Below market leases	99,133	102,098
Accumulated amortization	(29,187)	(18,372)
Lease intangible liabilities, net	69,946	83,726
Above market leases
Lease Intangible Assets:
Gross lease intangible assets	51,040	61,572
Tenant origination and absorption costs
Lease Intangible Assets:
Gross lease intangible assets	65,234	73,323
Tenant relationship
Lease Intangible Assets:
Gross lease intangible assets	$ 23,150	$ 26,936