Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS - Narrative (Details)

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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net $ 20,000,000.0  
Level 2 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed rate mortgages, fair value disclosure $ 252,900,000 $ 280,900,000
Weighted average market interest rate (percent) 2.06% 3.28%
Weighted average contractual interest rate (percent) 4.69% 4.81%
Reported Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed rate mortgages, fair value disclosure $ 224,700,000 $ 264,300,000
Designated as Hedging Instrument | Interest Rate Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amount $ 1,125,000,000.0 $ 1,125,000,000.0
Weighted average remaining term 3 years 6 months  
Weighted average fixed rate (percent) 1.90%