Notes Payable and Unsecured Credit Facilities - Schedule of Debt Net of Unamortized Debt Premium (Discount) and Debt Issuance Costs (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term Debt		$ 4,069,093	$ 3,726,754
Line of Credit		$ 77,000
Fixed Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Contractual Interest Rate		3.90%
Debt, Weighted Average Effective Interest Rate		4.10%
Long-term Debt		$ 452,512	342,135
Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Contractual Interest Rate		3.80%
Debt, Weighted Average Effective Interest Rate		4.00%
Long-term Debt		$ 3,251,659	3,248,373
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 3,992,093	3,726,754
Line of Credit [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Contractual Interest Rate	[1]	6.30%
Debt, Weighted Average Effective Interest Rate	[1]	6.60%
Line of Credit	[1]	$ 77,000
SOFR [Member] | Variable Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Contractual Interest Rate	[2]	4.10%
Debt, Weighted Average Effective Interest Rate	[2]	4.10%
Long-term Debt	[2]	$ 287,922	$ 136,246

[1] The Line is scheduled to mature on March 23, 2025. The Company has the option to extend the maturity for two additional six-month periods. Weighted average effective rate for the Line is calculated based on a fully drawn Line balance using the period end variable rate.

[2] As of September 30, 2023, 14 of these 16 variable rate loans, representing $283.0 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 16 loans range from 2.5% to 6.7%.