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Investments in Unconsolidated Real Estate Entities (Investment in PSB) (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 20, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Proceeds from sale of equity investment in PS Business Parks, Inc.				$ 2,636,011	$ 0
Gain on sale of equity investment in PS Business Parks, Inc.		$ 2,128,860	$ 0	2,128,860	0
Cash distribution received				134,460	59,251
PSB | Blackstone Real Estate
Schedule of Equity Method Investments [Line Items]
Business acquisition, share price (in dollars per share)	$ 187.50
Business acquisition, closing cash dividend (in dollars per share)	5.25
Business acquisition, prorated quarterly cash dividend (in dollars per share)	0.22
Business acquisition, share price with closing and prorated quarterly dividend (in dollars per share)	187.72
Business acquisition, share price merger consideration (in dollars per share)	$ 182.25
PSB
Schedule of Equity Method Investments [Line Items]
Common stock owned of PSB (in shares)	7,158,354
Limited partnership units in PSB (in shares)	7,305,355
Ownership interest (percentage)	41.00%
Cash distribution received				109,500	45,600
PSB | Blackstone Real Estate
Schedule of Equity Method Investments [Line Items]
Proceeds from sale of equity investment in PS Business Parks, Inc.	$ 2,700,000			$ 2,600,000
Gain on sale of equity investment in PS Business Parks, Inc.	$ 2,100,000
Shurgard
Schedule of Equity Method Investments [Line Items]
Common stock owned of PSB (in shares)		31,268,459		31,268,459		31,268,459
Ownership interest (percentage)		35.00%		35.00%
Cash distribution received				$ 37,800	21,500
Shurgard | Trademark License
Schedule of Equity Method Investments [Line Items]
Cash distribution received				$ 900	$ 900

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