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Notes Payable and Unsecured Credit Facilities - Schedule of Debt Net of Unamortized Debt Premium (Discount) and Debt Issuance Costs (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 3,726,754 | $ 3,718,944
Fixed Rate Mortgage Loans [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Maturity Date |  | Mar. 01, 2032 |
Debt, Weighted Average Contractual Interest Rate |  | 3.90% |
Debt, Weighted Average Effective Interest Rate |  | 3.50% |
Long-term Debt |  | $ 342,135 | 359,414
Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Maturity Date |  | Mar. 15, 2049 |
Debt, Weighted Average Contractual Interest Rate |  | 3.80% |
Debt, Weighted Average Effective Interest Rate |  | 4.00% |
Long-term Debt |  | $ 3,248,373 | 3,243,991
Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 3,726,754 | 3,718,944
Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Maturity Date | [1] | Mar. 23, 2025 |
Debt, Weighted Average Contractual Interest Rate | [1] | 5.00% |
Debt, Weighted Average Effective Interest Rate | [1] | 5.30% |
London Interbank Offered Rate (LIBOR) [Member] | Variable Rate Mortgage Loans [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Maturity Date | [2] | Jun. 02, 2027 |
Debt, Weighted Average Contractual Interest Rate | [2] | 3.40% |
Debt, Weighted Average Effective Interest Rate | [2] | 3.70% |
Long-term Debt | [2] | $ 136,246 | $ 115,539
[1] | Weighted-average effective rate for the Line is calculated based on a fully drawn Line balance using the period end variable rate.
[2] | 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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