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Fair Value Measurements (Details 2) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Liabilities: |  |
Interest rate derivatives | $ 15,072 | $ 3,160
Corporate Office Properties, L.P. |  |
Liabilities: |  |
Interest rate derivatives | 15,072 | $ 3,160
Fair value measurement on a recurring basis |  |
Assets: |  |
Assets | 5,671 |
Liabilities: |  |
Deferred compensation plan liability | 5,671 |
Interest rate derivatives | 15,072 |
Liabilities | 20,743 |
Fair value measurement on a recurring basis | Mutual funds |  |
Assets: |  |
Marketable securities in deferred compensation plan | 5,580 |
Fair value measurement on a recurring basis | Other |  |
Assets: |  |
Marketable securities in deferred compensation plan | 91 |
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Assets | 5,671 |
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 | 5,580 |
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 | 91 |
Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Assets | 0 |
Liabilities: |  |
Deferred compensation plan liability | 5,671 |
Interest rate derivatives | 15,072 |
Liabilities | 20,743 |
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. |  |
Liabilities: |  |
Interest rate derivatives | 15,072 |
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Other Observable Inputs (Level 2) |  |
Liabilities: |  |
Interest rate derivatives | $ 15,072 |

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