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Fair Value Measurements (Details 2) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Marketable securities in deferred compensation plan | $ 4,214 | $ 3,868
Fair value measurement on a recurring basis |  |
Assets: |  |
Interest rate derivatives | 2,602 |
Total assets | 6,816 |
Liabilities: |  |
Deferred compensation plan liability | 4,214 |
Interest rate derivatives | 11,894 |
Total liabilities | 16,108 |
Fair value measurement on a recurring basis | Mutual funds |  |
Assets: |  |
Marketable securities in deferred compensation plan | 4,171 |
Fair value measurement on a recurring basis | Other |  |
Assets: |  |
Marketable securities in deferred compensation plan | 43 |
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Total assets | 4,214 |
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 | 4,171 |
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 | 43 |
Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Interest rate derivatives | 2,602 |
Total assets | 2,602 |
Liabilities: |  |
Deferred compensation plan liability | 4,214 |
Interest rate derivatives | 11,894 |
Total liabilities | 16,108 |
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. |  |
Assets: |  |
Interest rate derivatives | 2,602 |
Liabilities: |  |
Interest rate derivatives | 11,894 |
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Interest rate derivatives | 2,602 |
Liabilities: |  |
Interest rate derivatives | $ 11,894 |

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