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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Liabilities: |  |  |  |
Interest rate derivatives | $ 3,121 | $ 1,855 |  |
Redeemable noncontrolling interest | 19,414 | 18,417 | $ 18,901 | $ 17,758
Corporate Office Properties, L.P. |  |  |  |
Liabilities: |  |  |  |
Interest rate derivatives | 3,121 | $ 1,855 |  |
Fair value measurement on a recurring basis |  |  |  |
Assets: |  |  |  |
Warrants to purchase common stock | 141 |  |  |
Assets | 6,014 |  |  |
Liabilities: |  |  |  |
Deferred compensation plan liability | 5,873 |  |  |
Interest rate derivatives | 3,121 |  |  |
Liabilities | 8,994 |  |  |
Redeemable noncontrolling interest | 19,414 |  |  |
Fair value measurement on a recurring basis | Mutual funds |  |  |  |
Assets: |  |  |  |
Marketable securities in deferred compensation plan | 5,765 |  |  |
Fair value measurement on a recurring basis | Other |  |  |  |
Assets: |  |  |  |
Marketable securities in deferred compensation plan | 108 |  |  |
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Assets: |  |  |  |
Assets | 5,873 |  |  |
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds |  |  |  |
Assets: |  |  |  |
Marketable securities in deferred compensation plan | 5,765 |  |  |
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other |  |  |  |
Assets: |  |  |  |
Marketable securities in deferred compensation plan | 108 |  |  |
Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets: |  |  |  |
Warrants to purchase common stock | 141 |  |  |
Assets | 141 |  |  |
Liabilities: |  |  |  |
Deferred compensation plan liability | 5,873 |  |  |
Interest rate derivatives | 3,121 |  |  |
Liabilities | 8,994 |  |  |
Fair value measurement on a recurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |
Liabilities: |  |  |  |
Redeemable noncontrolling interest | 19,414 |  |  |
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. |  |  |  |
Assets: |  |  |  |
Warrants to purchase common stock | 141 |  |  |
Liabilities: |  |  |  |
Interest rate derivatives | 3,121 |  |  |
Redeemable noncontrolling interest | 19,414 |  |  |
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets: |  |  |  |
Warrants to purchase common stock | 141 |  |  |
Liabilities: |  |  |  |
Interest rate derivatives | 3,121 |  |  |
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Unobservable Inputs (Level 3) |  |  |  |
Liabilities: |  |  |  |
Redeemable noncontrolling interest | $ 19,414 |  |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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