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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Liabilities: |  |  |  |  |
Interest rate derivatives | $ 2,236 |  | $ 3,309 |  |
Redeemable noncontrolling interest | 18,436 |  | 17,758 | 16,789 | 10,298
Corporate Office Properties, L.P. |  |  |  |  |
Liabilities: |  |  |  |  |
Interest rate derivatives | 2,236 |  | 3,309 |  |
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Assets: |  |  |  |  |
Assets | 7,500 |  |  |  |
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 | 7,187 | [1] |  |  |
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Common Shares |  |  |  |  |
Assets: |  |  |  |  |
Marketable securities in deferred compensation plan | 110 | [1] |  |  |
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 | 203 | [1] |  |  |
Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2) |  |  |  |  |
Assets: |  |  |  |  |
Interest rate derivatives | 2,907 | [2] |  |  |
Warrants to purchase common stock | 192 | [2] |  |  |
Assets | 3,099 |  |  |  |
Liabilities: |  |  |  |  |
Deferred compensation plan liability | 7,500 | [3] |  |  |
Interest rate derivatives | 2,236 |  |  |  |
Liabilities | 9,736 |  |  |  |
Fair value measurement on a recurring basis | Total Estimated Fair Value |  |  |  |  |
Assets: |  |  |  |  |
Interest rate derivatives | 2,907 | [2] |  |  |
Warrants to purchase common stock | 192 | [2] |  |  |
Assets | 10,599 |  |  |  |
Liabilities: |  |  |  |  |
Deferred compensation plan liability | 7,500 | [3] |  |  |
Interest rate derivatives | 2,236 |  |  |  |
Liabilities | 9,736 |  |  |  |
Redeemable noncontrolling interest | 18,436 |  |  |  |
Fair value measurement on a recurring basis | Total Estimated Fair Value | Mutual funds |  |  |  |  |
Assets: |  |  |  |  |
Marketable securities in deferred compensation plan | 7,187 | [1] |  |  |
Fair value measurement on a recurring basis | Total Estimated Fair Value | Common Shares |  |  |  |  |
Assets: |  |  |  |  |
Marketable securities in deferred compensation plan | 110 | [1] |  |  |
Fair value measurement on a recurring basis | Total Estimated Fair Value | Other |  |  |  |  |
Assets: |  |  |  |  |
Marketable securities in deferred compensation plan | 203 | [1] |  |  |
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Other Observable Inputs (Level 2) |  |  |  |  |
Assets: |  |  |  |  |
Interest rate derivatives | 2,907 | [4] |  |  |
Warrants to purchase common stock | 192 | [4] |  |  |
Assets | 3,099 |  |  |  |
Liabilities: |  |  |  |  |
Interest rate derivatives | 2,236 |  |  |  |
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Unobservable Inputs (Level 3) |  |  |  |  |
Liabilities: |  |  |  |  |
Redeemable noncontrolling interest | 18,436 |  |  |  |
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Total Estimated Fair Value |  |  |  |  |
Assets: |  |  |  |  |
Interest rate derivatives | 2,907 | [4] |  |  |
Warrants to purchase common stock | 192 | [4] |  |  |
Assets | 3,099 |  |  |  |
Liabilities: |  |  |  |  |
Interest rate derivatives | 2,236 |  |  |  |
Redeemable noncontrolling interest | $ 18,436 |  |  |  |
[1] | Included in the line entitled “restricted cash and marketable securities” on COPT’s consolidated balance sheet.
[2] | Included in the line entitled “prepaid expenses and other assets” on COPT’s consolidated balance sheet.
[3] | Included in the line entitled “other liabilities” on COPT’s consolidated balance sheet.
[4] | Included in the line entitled “prepaid expenses and other assets” on COPLP’s consolidated balance sheet.

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