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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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