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Real Estate Joint Ventures - Investments in Unconsolidated Real Estate Joint Ventures (Details) $ in Thousands | Jun. 30, 2021 USD ($) property | Jun. 02, 2021 | Dec. 31, 2020 USD ($)
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Unconsolidated Real Estate Joint Ventures |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of real estate properties | property | 19 |  |
Carrying value of Investments | $ 40,586 |  | $ 29,303
B RE COPT DC JV II LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Nominal Ownership % | 10.00% |  |
Number of real estate properties | property | 8 |  |
Carrying value of Investments | $ 15,877 |  | 15,988
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 | $ 7,300 |  | 7,400
BREIT COPT DC JV LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Nominal Ownership % | 10.00% |  |
Number of real estate properties | property | 9 |  |
Carrying value of Investments | $ 12,840 |  | 13,315
B RE COPT DC JV III LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Nominal Ownership % | 10.00% | 10.00% |
Number of real estate properties | property | 2 |  |
Carrying value of Investments | $ 11,869 |  | $ 0

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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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