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, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate cash flow hedge losses to be reclassified during next 12 months $ 20,300,000  
Level 2 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed rate mortgages, fair value disclosure $ 325,100,000 $ 249,700,000
Weighted average market interest rate (percent) 2.38% 2.12%
Weighted average contractual interest rate (percent) 4.12% 4.69%
Reported Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed rate mortgages, fair value disclosure $ 305,000,000 $ 223,600,000
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 $ 1,125,000,000
Weighted average remaining term 3 years 1 month 6 days  
Weighted average fixed rate (percent) 1.92%