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REAL ESTATE INVESTMENTS - Purchase Price Allocation (Additional Information) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 11, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 05, 2018
Business Acquisition [Line Items] |  |  |  |  |
Outstanding principal balances on mortgage debt assumed |  | $ 313,812 | $ 320,869 |  |
Repayments of mortgage debt assumed |  | $ 7,595 | $ 122,180 | $ 4,931 |
Mortgage Debt Assumed - at Fair Value |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Repayments of mortgage debt assumed | $ 115,500 |  |  |  |
Four Tower Bridge | Mortgage Debt Assumed - at Fair Value |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Outstanding principal balances on mortgage debt assumed |  |  |  |  | $ 9,700

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