Mortgages and Notes Payable (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2023 USD ($) extension	Oct. 17, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Mortgages and notes payable	$ 3,212,185,000		$ 3,212,185,000			$ 3,197,215,000
Unamortized debt issuance costs	$ (15,149,000)		(15,149,000)			(16,393,000)
Maximum liquidity requirements	1 year
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity on credit facility					$ 750,000,000
Additional borrowing capacity on revolving credit facility	$ 200,000,000		$ 200,000,000
Number of additional extensions | extension			2
Term of optional extension			6 months
Temporary reduction in interest rate due to sustainability goals (in hundredths)			0.01%
Amount outstanding on revolving credit facility	205,000,000		$ 205,000,000
Outstanding letters of credit on revolving credit facility	900,000		900,000
Unused borrowing capacity on revolving credit facility	544,100,000		$ 544,100,000
5.69% Mortgage Loan Due 2028 [Member]
Debt Instrument [Line Items]
Principal amount of debt		$ 200,000,000
Term of debt instrument		5 years
Effective interest rate (in hundredths)		5.69%
Debt issuance costs		$ 1,300,000
Variable Rate Term Loan Due 2024
Debt Instrument [Line Items]
Term of optional extension			1 year
Principal amount of debt	200,000,000		$ 200,000,000
Secured indebtedness [Member]
Debt Instrument [Line Items]
Mortgages and notes payable	677,839,000		677,839,000			483,988,000
Aggregate undepreciated book value of secured real estate assets	1,170,700,000		1,170,700,000
Unsecured indebtedness [Member]
Debt Instrument [Line Items]
Mortgages and notes payable	$ 2,549,495,000		$ 2,549,495,000			$ 2,729,620,000
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Facility interest rate basis			SOFR
Interest rate, basis spread (in hundredths)			0.85%
Annual facility fee (in hundredths)			0.20%
SOFR Related Spread Adjustment [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate, basis spread (in hundredths)			0.10%
Subsequent Event [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount outstanding on revolving credit facility				$ 205,000,000
Outstanding letters of credit on revolving credit facility				900,000
Unused borrowing capacity on revolving credit facility				$ 544,100,000