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FAIR VALUE MEASUREMENTS - Interest Rates Used for Fair Value of Mortgages Payable (Details) - Mortgages | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Low |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value input, interest rate | 1.70% | 1.70%
High |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value input, interest rate | 1.90% | 2.10%

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