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FAIR VALUE MEASUREMENTS - Interest Rates Used for Fair Value of Mortgages Payable (Details) - Mortgages | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Low |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value input, interest rate | 2.10% | 2.00%
High |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value input, interest rate | 2.50% | 2.30%

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