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FAIR VALUE MEASUREMENTS - Interest Rates Used for Fair Value of Mortgages Payable (Details) - Mortgages	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2017
Low
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input, interest rate	2.00%	1.75%
High
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input, interest rate	2.30%	2.20%

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- Definition

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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