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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%