Mortgages and Notes Payable (Details)	3 Months Ended
	Mar. 31, 2023 USD ($) extension	Apr. 21, 2023 USD ($)	Apr. 18, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Mortgages and notes payable	$ 3,263,969,000			$ 3,197,215,000
Unamortized debt issuance costs	$ (16,899,000)			(16,393,000)
Maximum liquidity requirements	1 year
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Additional borrowing capacity on revolving credit facility	$ 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	$ 255,000,000
Outstanding letters of credit on revolving credit facility	900,000
Unused borrowing capacity on revolving credit facility	494,100,000
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
Secured indebtedness [Member]
Debt Instrument [Line Items]
Mortgages and notes payable	681,956,000			483,988,000
Aggregate undepreciated book value of secured real estate assets	1,157,200,000
Unsecured indebtedness [Member]
Debt Instrument [Line Items]
Mortgages and notes payable	$ 2,598,912,000			$ 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]
Maximum borrowing capacity on credit facility		$ 750,000,000
Amount outstanding on revolving credit facility			$ 257,000,000
Outstanding letters of credit on revolving credit facility			900,000
Unused borrowing capacity on revolving credit facility			$ 492,100,000