Notes Payable and Unsecured Credit Facilities - Schedule of Debt Net of Unamortized Debt Premium (Discount) and Debt Issuance Costs (Details) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term Debt		$ 3,709,074	$ 3,726,754
Fixed Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Contractual Interest Rate		3.90%
Debt, Weighted Average Effective Interest Rate		3.40%
Long-term Debt		$ 326,471	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		$ 3,250,564	3,248,373
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 3,709,074	3,726,754
Line of Credit [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Contractual Interest Rate	[1]	6.00%
Debt, Weighted Average Effective Interest Rate	[1]	6.40%
SOFR [Member] | Variable Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Contractual Interest Rate	[2]	3.80%
Debt, Weighted Average Effective Interest Rate	[2]	3.90%
Long-term Debt	[2]	$ 132,039	$ 136,246

[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 $129.8 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 6.0%.