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, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 24, 2019
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 $ 20,000,000.0    
Fixed rate mortgages payable | Fixed rate mortgages payable      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Weighted average contractual interest rate (percent) 4.69% 4.81%  
Reported value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fixed rate mortgages, fair value disclosure $ 223,600,000 $ 264,300,000  
Fair value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fixed rate mortgages, fair value disclosure $ 249,700,000 $ 280,900,000  
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 0.0212 0.0328  
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 $ 1,125,000,000.0  
Weighted average remaining term (in years) 3 years 3 months 18 days    
Weighted average fixed rate (percent) 1.90%