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FAIR VALUE MEASUREMENTS - Interest Rates Used for Fair Value of Mortgages Payable (Details) - Mortgages | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2015 | Sep. 30, 2016
Low |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value input, interest rate | 2.00% | 2.10%
High |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value input, interest rate | 2.30% | 2.40%

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