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REAL ESTATE AND RELATED LEASE INTANGIBLES, NET - Additional Information (Details) - USD ($) $ in Thousands					3 Months Ended		12 Months Ended
		May 01, 2019	Feb. 06, 2019	Jan. 10, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Feb. 28, 2019
Business Acquisition [Line Items]
Foreclosed properties held in real estate					$ 24,400		$ 6,300
Gross intangible assets					162,000	$ 162,000
Accumulated amortization					60,600	57,700
Net intangible assets					101,400	104,300
Unamortized favorable/unfavorable lease intangibles					5,000	5,500
Increase in operating lease income, amortization of below market lease intangibles acquired					600	600
Proceeds from lease prepayments				$ 10,000
Real estate and related lease intangibles, net	[1]				1,005,997		998,022
Accumulated depreciation and amortization					184,347		173,938
Mortgage loan and financing related to property sales			$ 6,600
Gain (loss) on extinguishment/defeasance of debt			$ (1,100)		(1,070)	(69)
Impairment of real estate					1,350	0	0
Operating property income					28,921
Depreciation and amortization					10,227	10,823
Unbilled rent receivables					1,000	800
Unencumbered real estates					80,300	58,600
Real estate acquired through foreclosure								$ 18,200
Real estate operating income					200
Unamortized discounts included in mortgage loan receivables held for investment, at amortized cost					$ 500		$ 500
Weighted average amortization period for intangible assets acquired					36 months 21 days
Revenues from acquisitions					$ 16
Net earnings (loss)					(200)
Above Market Leases
Business Acquisition [Line Items]
Decrease in operating lease income, amortization of above market lease intangibles acquired					(400)	$ (200)
Wayne, New Jersey
Business Acquisition [Line Items]
Real estate and related lease intangibles, net					5,600
Accumulated depreciation and amortization					2,700
Subsequent Event
Business Acquisition [Line Items]
Operating property income		$ 3,900
Loss on sale of real estate		3,500
Depreciation and amortization		400
Loss on sale of real estate		$ (20)
Real Estate Acquired in Satisfaction of Debt
Business Acquisition [Line Items]
Real estate acquired through foreclosure					18,200
Accrued interest					200
Loans in default, no losses expected					17,800
Unamortized discounts included in mortgage loan receivables held for investment, at amortized cost					$ 100
[1] Includes amounts relating to consolidated variable interest entities. See Note 3.

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