Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS - Narrative (Details)

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FAIR VALUE MEASUREMENTS - Narrative (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unrealized losses $ 2,700,000    
Unrealized gains     $ 1,100,000
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 3.08% 3.09%  
Level 2 | Weighted Average | Fixed Rate Private Placement Notes | Measurement Input, Discount Rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Weighted average market interest rate 0.0396 0.0281  
Level 2 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fixed rate mortgages, fair value disclosure $ 301,800,000 $ 319,900,000  
Weighted average market interest rate (percent) 4.03% 2.55%  
Weighted average contractual interest rate (percent) 4.11% 4.12%  
Estimate of Fair Value Measurement      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Private placement notes $ 961,900,000 $ 931,100,000  
Reported Value Measurement      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Private placement notes 1,030,000,000.00 905,000,000  
Fixed rate mortgages, fair value disclosure 302,900,000 303,900,000  
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 2 years 7 months 6 days