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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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