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Real Estate Joint Ventures (Narrative) (Details) $ in Thousands, ft² in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 22, 2020 USD ($) property | Dec. 31, 2022 USD ($) ft² property | Dec. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property | Dec. 21, 2020
Investments in real estate joint ventures |  |  |  |  |
Ownership percentage sold |  | 90.00% | 90.00% | 90.00% |
Number of properties sold | property |  | 2 | 2 | 2 |
Gain on sale of investment in unconsolidated real estate joint venture |  | $ 0 | $ 0 | $ 29,416 |
BRE-COPT 2 |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |
Nominal Ownership % | 10.00% | 10.00% |  | 10.00% |
BRE-COPT 3 |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |
Nominal Ownership % |  | 10.00% | 10.00% |  |
Quark |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |
Nominal Ownership % |  | 10.00% |  |  |
GI-COPT DC Partnership LLC |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |
Nominal Ownership % |  |  |  |  | 50.00%
Ownership interest sold of the original 50% owned | 80.00% |  |  |  |
Proceeds from sale of investment in unconsolidated real estate joint venture | $ 60,000 |  |  |  |
Gain on sale of investment in unconsolidated real estate joint venture | $ 29,400 |  |  |  |
LW Redstone Company, LLC |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |
Partner's capital account upon formation |  | $ 9,000 |  |  |
Percentage of cumulative preferred returns of cash flows on partners' invested capital |  | 13.50% |  |  |
Percentage of cumulative preferred returns of cash flows on our invested capital |  | 13.50% |  |  |
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the company |  | 85.00% |  |  |
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the entity's partners |  | 15.00% |  |  |
Number of years following construction commencement threshold achievement before partner's interest can be purchased at fair value |  | 5 years |  |  |
Construction commencement threshold (in square feet) | ft² |  | 4.4 |  |  |
Construction commencement completed (in sqft) | ft² |  | 2.5 |  |  |
LW Redstone Company, LLC | Maximum |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |
Infrastructure costs anticipated to be funded by entity for reimbursement by the City of Huntsville (in dollars) |  | $ 76,000 |  |  |
LW Redstone Company, LLC | Notes receivable from the City of Huntsville |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |
Infrastructure costs funded to date for reimbursement by the City of Huntsville |  | $ 70,400 |  |  |
Stevens Investors, LLC | Maximum |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the company |  | 85.00% |  |  |
Stevens Investors, LLC | Minimum |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the company |  | 60.00% |  |  |
M Square Associates, LLC |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |
Percentage of residual amounts distributed to each member |  | 50.00% |  |  |
GI-COPT DC Partnership LLC | BRE-COPT 2 |  |  |  |  |
Investments in real estate joint ventures |  |  |  |  |
Number of properties sold | property | 6 |  |  |  |

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