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Mortgages and Notes Payable - Credit Agreement Terms (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Unsecured Term Loan    
Debt Instrument [Line Items]    
Unamortized debt $ 1,554,000 $ 2,057,000
Unsecured Revolving Credit Facility, Expiring February 2023 | Revolving Credit Facility    
Debt Instrument [Line Items]    
Revolving credit facility borrowings 0  
Line of credit remaining borrowing capacity 600,000,000  
Unsecured Revolving Credit Facility, Expiring February 2023 | Unsecured Term Loan    
Debt Instrument [Line Items]    
Revolving credit facility borrowings 600,000,000  
Unsecured Term Loan, Expiring January 2025 | Unsecured Term Loan    
Debt Instrument [Line Items]    
Face amount $ 300,000,000  
Interest Rate 2.732%  
London Interbank Offered Rate (LIBOR) | Unsecured Revolving Credit Facility, Expiring February 2023 | Revolving Credit Facility    
Debt Instrument [Line Items]    
Basis spread on variable rate 0.90%  
London Interbank Offered Rate (LIBOR) | Unsecured Revolving Credit Facility, Expiring February 2023 | Revolving Credit Facility | Minimum    
Debt Instrument [Line Items]    
Basis spread on variable rate 0.775%  
London Interbank Offered Rate (LIBOR) | Unsecured Revolving Credit Facility, Expiring February 2023 | Revolving Credit Facility | Maximum    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.45%  
London Interbank Offered Rate (LIBOR) | Unsecured Term Loan, Expiring January 2025 | Unsecured Term Loan    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.00%