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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
derivative
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges   $ 5,000,000 $ 0 $ 8,183,000
Sales Price   327,903,000    
Variable rate debt   1,050,051,000 991,502,000  
Accumulated other comprehensive income - unrealized income (loss) on valuation of swap agreements   (4,500,000) (4,000,000)  
Cash flow hedge gain (loss) to be reclassified within 12 months   $ 4,300,000    
Cash Flow Hedging [Member] | Variable-Rate Derivatives [Member] | Maximum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, cap interest rate   4.00%    
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Fixed-Rate Derivatives, Maturing between March 2015 and April 2023 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, notional amount   $ 256,500,000    
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Fixed-Rate Derivatives, Maturing between March 2015 and April 2023 [Member] | Minimum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, fixed interest rate   0.70%    
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Fixed-Rate Derivatives, Maturing between March 2015 and April 2023 [Member] | Maximum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, fixed interest rate   5.62%    
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Variable-Rate Derivatives [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, notional amount   $ 29,500,000    
Cash Flow Hedging [Member] | Forward Contracts [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, number of instruments held | derivative   1    
Variable rate debt   $ 50,000,000    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, assets   0    
Derivative financial instruments, liabilities   0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, assets   818,000 200,000  
Derivative financial instruments, liabilities   5,876,000 $ 4,600,000  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, assets   0    
Derivative financial instruments, liabilities   0    
Fund III [Member] | Walnut Hill Plaza [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges       1,500,000
Fund III [Member] | Sheepshead Bay [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges       $ 6,700,000
Sales Price $ 20,200,000      
Brandywine Portfolio [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges   $ 5,000,000