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Notes Payable and Unsecured Credit Facilities - Schedule of Debt Net of Unamortized Debt Premium (Discount) and Debt Issuance Costs (Parentheticals) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Long-term Debt $ 3,729,404 $ 3,718,944
Line of Credit 1,250,000  
Variable Rate Mortgage Loans [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Long-term Debt [1] 137,284 $ 115,539
Variable Rate Mortgage Loans [Member] | London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swaps [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 132,400  
Variable Rate Mortgage Loans [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Debt instrument, effective fixed interest rate 2.50%  
Variable Rate Mortgage Loans [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Debt instrument, effective fixed interest rate 4.10%  
[1] Five of these six variable rate loans, representing $132.4 million of debt in the aggregate, have interest rate swaps in place to mitigate interest rate fluctuation risk. Based on these swap agreements, the effective fixed rates of the five loans range from 2.5% to 4.1%.