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, 2021
USD ($)
Dec. 31, 2020
USD ($)
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 $ 16,500,000  
Fixed rate private placement notes | Unsecured debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted average contractual interest rate (percent) 3.09%  
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) 4.12% 4.69%
Reported value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable, fair value disclosure $ 905,000,000 $ 400,000,000
Fixed rate mortgages, fair value disclosure 303,900,000 223,600,000
Fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes payable, fair value disclosure 931,100,000  
Fixed rate mortgages, fair value disclosure $ 319,900,000 $ 249,700,000
Level 2 | Weighted average market rate | Weighted Average | Fixed rate private placement notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted average market interest rate (percent) 0.0281  
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]    
Weighted average market interest rate (percent) 0.0255 0.0212
Designated as hedging instrument | Interest rate swap | Cash flow hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Aggregate notional amount $ 1,125,000,000 $ 1,125,000,000
Weighted average remaining term (in years) 2 years 9 months 18 days  
Weighted average fixed rate (percent) 1.92%