Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS - Narrative (Details)

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FAIR VALUE MEASUREMENTS - Narrative (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
Apr. 24, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated unrealized losses to be reclassified into earnings in the next 12 months $ 3,200,000    
Fixed rate mortgages payable | Mortgages      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Weighted average contractual interest rate (percent) 4.81%   4.85%
Reported value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fixed rate mortgages, fair value disclosure $ 264,300,000   $ 268,100,000
Fair value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fixed rate mortgages, fair value disclosure $ 280,900,000   $ 276,500,000
Level 2 | Weighted average market rate | Weighted Average | Fixed rate mortgages payable      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fixed rate mortgages, fair value measurement Input 0.0328   0.0417
Interest rate swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Aggregate notional amount   $ 100,000,000.0  
Interest rate swap | Designated as hedging instrument | Cash flow hedges      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Aggregate notional amount $ 1,125,000,000.0   $ 795,000,000.0
Weighted average remaining term (in years) 4 years 3 months 18 days    
Weighted average fixed rate (percent) 1.90%