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Real Estate Joint Ventures (Details) (USD $) |  | 9 Months Ended |  | 9 Months Ended | 0 Months Ended
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Sep. 30, 2014 Consolidated real estate joint ventures | Sep. 30, 2014 LW Redstone Company, LLC buillding | Sep. 30, 2014 LW Redstone Company, LLC Variable Interest Entity, Primary Beneficiary [Member] | Sep. 30, 2014 M Square Associates, LLC buillding | Sep. 30, 2014 M Square Associates, LLC Variable Interest Entity, Primary Beneficiary [Member] | Aug. 07, 2014 COPT-FD Indian Head, LLC Variable Interest Entity, Primary Beneficiary [Member]
Investments in consolidated real estate joint ventures |  |  |  |  |  |  |  |  |  |  |
Ownership (as a percent) |  |  |  |  | 85.00% |  |  |  | 50.00% |  |
Total Assets | $ 199,429,000 | [1] |  |  | $ 139,314,000 | [1],[2] |  |  | $ 60,115,000 | [1],[3] |
Encumbered Assets | 114,915,000 | [1] |  |  | 67,100,000 | [1],[2] |  |  | 47,815,000 | [1],[3] |
Total Liabilities | 81,944,000 | [1] |  |  | 42,134,000 | [1],[2] |  |  | 39,810,000 | [1],[3] |
Buildings Operated by Joint Ventures Number |  |  | 4 | [2] |  |  | 2 | [3] |  |  |
Proceeds from the repurchase of real estate |  |  |  |  |  |  |  |  |  |  | $ 6,400,000
[1] | Excludes amounts eliminated in consolidation.
[2] | This joint venture’s property is in Huntsville, Alabama.
[3] | This joint venture’s properties are in College Park, Maryland (in the Baltimore/Washington Corridor).

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- Definition The carrying amount, as of the date of the latest financial statement presented, of real estate owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=34720971&loc=SL6224234-111729 + Details
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