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Investments in Unconsolidated Real Estate Entities (Investment in PSB) (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jul. 20, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Proceeds from sale of equity investment in PS Business Parks, Inc.		$ 2,636,011	$ 0	$ 0
Gain on sale of equity investment in PS Business Parks, Inc.		2,128,860	0	0
Cash distribution received		134,769	150,488	72,098
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	$ 127,300	$ 60,700
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
Gain on sale of equity investment in PS Business Parks, Inc.	$ 2,100,000
PSB | Blackstone Real Estate
Schedule of Equity Method Investments [Line Items]
Proceeds from sale of equity investment in PS Business Parks, Inc.		$ 2,600,000
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%	35.00%
Cash distribution received		$ 37,800	$ 41,500	$ 34,900
Shurgard | Trademark License
Schedule of Equity Method Investments [Line Items]
Cash distribution received		$ 1,200	$ 1,200	$ 1,100

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