Debt (Schedule of Debt) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument
Deferred financing costs, net and other	$ (64,018,000)	$ (63,572,000)
Total, net	5,717,338,000	5,829,018,000
Long term debt	$ 2,560,859,000	2,560,025,000
Mortgages Payable:
Debt Instrument
Interest rate, end of period (percent)	4.37%
Long-term debt, gross	$ 5,767,215,000	5,877,615,000
Deferred financing costs, net and other	(49,877,000)	(48,597,000)
Total, net	$ 5,717,338,000	5,829,018,000
Mortgages Payable: | Fixed rate
Debt Instrument
Interest rate, end of period (percent)	3.63%
Long-term debt, gross	$ 3,569,550,000	3,570,000,000
Mortgages Payable: | Variable rate
Debt Instrument
Interest rate, end of period (percent)	5.57%
Long-term debt, gross	$ 2,197,665,000	2,307,615,000
Mortgages Payable: | Variable rate | Interest Rate Cap
Debt Instrument
Derivative, notional amount	$ 2,009,119
Cap strike rate (as percent)	3.98%
Derivative, average remaining maturity (in months)	11 months
Unsecured Debt:
Debt Instrument
Interest rate, end of period (percent)	3.02%
Long-term debt, gross	$ 1,200,000,000	1,200,000,000
Deferred financing costs, net and other	(7,658,000)	(8,168,000)
Long term debt	$ 1,192,342,000	1,191,832,000
Unsecured term loan
Debt Instrument
Interest rate, end of period (percent)	4.05%
Long-term debt, gross	$ 800,000,000	800,000,000
Deferred financing costs, net and other	(6,483,000)	(6,807,000)
Long term debt	$ 793,517,000	793,193,000
Unsecured revolving credit facilities
Debt Instrument
Interest rate, end of period (percent)	3.88%
Long term debt	$ 575,000,000	$ 575,000,000