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Properties, Net (Narrative) (Details) ft² in Thousands, $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 10, 2023 USD ($) property | Dec. 14, 2022 USD ($) property | Jan. 25, 2022 USD ($) | Dec. 30, 2021 USD ($) | Jun. 02, 2021 USD ($) property | Oct. 30, 2020 USD ($) property | Sep. 30, 2020 USD ($) | Dec. 31, 2022 USD ($) ft² property | Dec. 31, 2021 USD ($) ft² property | Dec. 31, 2020 USD ($) ft² property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage sold |  |  |  |  |  |  |  | 90.00% | 90.00% | 90.00%
Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  |  |  |  | Discontinued operations |  |
Number of properties sold | property |  |  |  |  |  |  |  | 2 | 2 | 2
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  | Gain on sales of real estate |  |  |  | Gain on sales of real estate | Gain on sales of real estate | Gain on sales of real estate
Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] | Gain on sales of real estate |  |  |  |  |  |  |  |  |
Quark JV LLC |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Nominal Ownership % |  | 10.00% |  |  |  |  |  |  |  |
BRE- COPT 3 |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Nominal Ownership % |  |  |  |  | 10.00% |  |  |  |  |
BRE- COPT 2 |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Nominal Ownership % |  |  |  |  |  | 10.00% |  |  |  |
Newly-Formed Joint Venture | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Nominal Ownership % | 10.00% |  |  |  |  |  |  |  |  |
Baltimore, Maryland |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  | $ 1,500 |  |  |
Newly-developed properties placed in service |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Area of real estate property (in sqft or acres) | ft² |  |  |  |  |  |  |  | 1,300 | 766 | 1,800
Number of real estate properties | property |  |  |  |  |  |  |  | 9 | 8 | 11
Expansion of Fully-Operational Properties Placed in Service |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Area of real estate property (in sqft or acres) | ft² |  |  |  |  |  |  |  | 14 |  | 42
Number of real estate properties | property |  |  |  |  |  |  |  | 1 |  | 3
Properties under development |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Area of real estate property (in sqft or acres) | ft² |  |  |  |  |  |  |  | 1,000 |  |
Number of real estate properties | property |  |  |  |  |  |  |  | 7 |  |
Properties Under Development, Partially-Operational |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  |  |  |  |  | 2 |  |
Redeveloped Property Placed in Service |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Area of real estate property (in sqft or acres) | ft² |  |  |  |  |  |  |  |  |  | 21
Data Center Shells in Northern Virginia | Disposed of by sale |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of real estate properties held for sale | property |  |  |  |  |  |  |  | 3 |  |
Ownership percentage sold |  | 90.00% |  |  | 90.00% | 90.00% |  |  |  |
Transaction value |  | $ 67,000 |  |  | $ 118,800 | $ 89,700 |  |  |  |
Number of properties sold | property |  | 2 |  |  | 2 | 2 |  |  |  |
Proceeds from sale |  | $ 60,300 |  |  | $ 106,900 | $ 80,700 |  |  |  |
Gain on disposal |  |  |  |  |  |  |  | $ 19,200 | $ 40,200 | $ 30,000
Data Center Shells in Northern Virginia | Disposed of by sale | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage sold | 90.00% |  |  |  |  |  |  |  |  |
Transaction value | $ 211,300 |  |  |  |  |  |  |  |  |
Number of properties sold | property | 3 |  |  |  |  |  |  |  |  |
Proceeds from sale | $ 190,200 |  |  |  |  |  |  |  |  |
Gain on disposal | $ 49,000 |  |  |  |  |  |  |  |  |
Wholesale Data Center | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Transaction value |  |  | $ 222,500 |  |  |  |  |  |  |
Gain on disposal |  |  | $ 28,600 |  |  |  |  | $ 28,564 | $ 0 | $ 0
Other Data Center Shells | Disposed of by sale |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  | $ 30,000 |  |  |  |  |  |
Gain on disposal |  |  |  | $ 25,900 |  |  |  |  |  |

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