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Real Estate Joint Ventures (Unconsolidated Real Estate Joint Ventures) (Details) $ in Thousands | Dec. 31, 2020 USD ($) property | Dec. 22, 2020 | Dec. 21, 2020 | Oct. 30, 2020 | Dec. 31, 2019 USD ($)
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Unconsolidated Real Estate Joint Ventures |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of real estate properties | property | 17 |  |  |  |
Real estate equity method investments | $ 29,303 |  |  |  | $ 51,949
B RE COPT DC JV II LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 10.00% | 10.00% |  | 10.00% |
Number of real estate properties | property | 8 |  |  |  |
Real estate equity method investments | $ 15,988 |  |  |  | $ 0
Difference between the joint venture's cost basis and the entity's share of B RE COPT’s underlying equity in the net assets acquired from GI-COPT | $ 7,400 |  |  |  |
BREIT COPT DC JV LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 10.00% |  |  |  | 10.00%
Number of real estate properties | property | 9 |  |  |  |
Real estate equity method investments | $ 13,315 |  |  |  | $ 14,133
GI-COPT DC Partnership LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage |  |  | 50.00% |  | 50.00%
Real estate equity method investments | $ 0 |  |  |  | $ 37,816

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