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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 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 3,726,754 | $ 3,718,944
Variable Rate Mortgage Loans [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [1] | 136,246 | $ 115,539
Variable Rate Mortgage Loans [Member] | London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 132,100 |
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 $132.1 million of debt in the aggregate, have interest rate swaps in place to mitigate interest rate fluctuation risk. With these swap agreements, the fixed rates of the loans range f rom 2.5% to 4.1%.

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