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Investments in Unconsolidated Real Estate Entities (Schedule Of Investments In Real Estate Entities And Equity In Earnings Of Real Estate Entities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Investments in Unconsolidated Real Estate Entities at	$ 779,272		$ 779,272		$ 773,046
Equity in Earnings of Unconsolidated Real Estate Entities for the	32,860	$ 21,240	81,382	$ 62,863
PSB
Schedule of Equity Method Investments [Line Items]
Investments in Unconsolidated Real Estate Entities at	451,336		451,336		431,963
Equity in Earnings of Unconsolidated Real Estate Entities for the	27,110	16,548	62,494	51,513
Shurgard
Schedule of Equity Method Investments [Line Items]
Investments in Unconsolidated Real Estate Entities at	327,936		327,936		$ 341,083
Equity in Earnings of Unconsolidated Real Estate Entities for the	$ 5,750	$ 4,692	$ 18,888	$ 11,350

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