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Real Estate Joint Ventures (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014 buillding
Consolidated real estate joint ventures |  |
Investments in consolidated real estate joint ventures |  |
Total Assets | $ 202,785 | [1]
Pledged Assets | 115,858 | [1]
Total Liabilities | 78,771 | [1]
LW Redstone Company, LLC |  |
Investments in consolidated real estate joint ventures |  |
Ownership (as a percent) | 85.00% |
Total Assets | 136,090 | [1],[2]
Pledged Assets | 67,831 | [1],[2]
Total Liabilities | 38,632 | [1],[2]
Buildings Operated by Joint Ventures Number | 4 | [2]
M Square Associates, LLC |  |
Investments in consolidated real estate joint ventures |  |
Ownership (as a percent) | 50.00% |
Total Assets | 60,259 | [1],[3]
Pledged Assets | 48,027 | [1],[3]
Total Liabilities | 40,139 | [1],[3]
Buildings Operated by Joint Ventures Number | 2 | [3]
COPT-FD Indian Head, LLC |  |
Investments in consolidated real estate joint ventures |  |
Ownership (as a percent) | 75.00% |
Total Assets | $ 6,436 | [1],[4]
[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).
[4] | This joint venture’s property is in Charles County, Maryland. In 2012, the joint venture exercised its option under a development agreement to require Charles County to repurchase the land parcel at its original acquisition cost. Under the terms of the agreement with Charles County, the repurchase is expected to occur by August 2014.

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- Definition The carrying amount of the consolidated joint venture's assets included in the reporting entity's statement of financial position. + References No definition available. + Details
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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=7523297&loc=SL6224234-111729 + Details
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