The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Real Estate Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 4,506,000	$ 13,282,000	$ 13,256,000
Future amortization expense, 2020	1,848,000
Future amortization expense, 2021	1,256,000
Future amortization expense, 2022	1,003,000
Future amortization expense, 2023	804,000
Future amortization expense, 2024	786,000
Interest expense capitalized	2,504,000	3,225,000	$ 2,314,000
Intangible Lease Assets And Other Assets \| Above-market/Below-market leases
Finite Lived Intangible Assets [Line Items]
Cost	21,098,000	28,165,000
Intangible lease assets and liabilities, Accumulated Amortization	(18,559,000)	(24,890,000)
Intangible Lease Assets And Other Assets \| In-place leases
Finite Lived Intangible Assets [Line Items]
Cost	66,309,000	92,750,000
Intangible lease assets and liabilities, Accumulated Amortization	(58,559,000)	(78,796,000)
Intangible Lease Assets And Other Assets \| Tenant relationships
Finite Lived Intangible Assets [Line Items]
Cost	38,880,000	41,561,000
Intangible lease assets and liabilities, Accumulated Amortization	(10,834,000)	(10,135,000)
Accounts Payable and Accrued Liabilities \| Above-market/Below-market leases
Finite Lived Intangible Assets [Line Items]
Cost	46,554,000	63,719,000
Intangible lease assets and liabilities, Accumulated Amortization	$ (38,052,000)	$ (50,146,000)
Buildings
Finite Lived Intangible Assets [Line Items]
Useful life of property, plant and equipment	40 years
Certain Improvements \| Minimum
Finite Lived Intangible Assets [Line Items]
Useful life of property, plant and equipment	10 years
Certain Improvements \| Maximum
Finite Lived Intangible Assets [Line Items]
Useful life of property, plant and equipment	20 years
Equipment and Fixtures \| Minimum
Finite Lived Intangible Assets [Line Items]
Useful life of property, plant and equipment	7 years
Equipment and Fixtures \| Maximum
Finite Lived Intangible Assets [Line Items]
Useful life of property, plant and equipment	10 years