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Related Party Transactions (Narrative) (Details) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Jul. 08, 2022 USD ($) site property | Sep. 30, 2022 USD ($) adult_children storage_facility | Sep. 30, 2021 USD ($)
Related Party Transaction [Line Items] |  |  |
Tenants reinsurance premiums earned by subsidiaries |  | $ 1,700 | $ 1,500
Proceeds from sale of equity investment in PS Business Parks, Inc. |  | $ 2,636,011 | $ 0
Commercial Interests |  |  |
Related Party Transaction [Line Items] |  |  |
Number of sites in commercial interest acquisition | site | 3 |  |
Total cost of acquisition | $ 47,300 |  |
Real estate investments, net | 27,000 |  |
Intangible assets, gross (excluding goodwill) | $ 700 |  |
Number of properties acquired | property | 5 |  |
Canada | Hughes Owned Canadian Facilities |  |  |
Related Party Transaction [Line Items] |  |  |
Number of self-storage facilities | storage_facility |  | 65 |
Number of ms. gustavson's adult children owning remaining equity in LLC | adult_children |  | 2 |
Ownership interest by parent |  | 0.00% |
Canada | Hughes Owned Canadian Facilities | Tamara Hughes Gustavson |  |  |
Related Party Transaction [Line Items] |  |  |
Ownership interest of noncontrolling owners (less than) |  | 0.10% |

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