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Fair Value Measurements (Details 2) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Marketable securities in deferred compensation plan | $ 3,868 | $ 4,616
Fair value measurement on a recurring basis [Member] |  |
Assets: |  |
Interest rate derivatives | 5,617 | 3,073
Total assets | 9,485 | 7,689
Liabilities: |  |
Deferred compensation plan liability | 3,868 | 4,616
Interest rate derivatives | 5,459 |
Total liabilities | 9,327 |
Fair value measurement on a recurring basis [Member] | Mutual funds [Member] |  |
Assets: |  |
Marketable securities in deferred compensation plan | 3,819 | 4,547
Fair value measurement on a recurring basis [Member] | Other [Member] |  |
Assets: |  |
Marketable securities in deferred compensation plan | 49 | 69
Fair value measurement on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets: |  |
Total assets | 3,868 | 4,616
Fair value measurement on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mutual funds [Member] |  |
Assets: |  |
Marketable securities in deferred compensation plan | 3,819 | 4,547
Fair value measurement on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other [Member] |  |
Assets: |  |
Marketable securities in deferred compensation plan | 49 | 69
Fair value measurement on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Interest rate derivatives | 5,617 | 3,073
Total assets | 5,617 | 3,073
Liabilities: |  |
Deferred compensation plan liability | 3,868 | 4,616
Interest rate derivatives | 5,459 |
Total liabilities | 9,327 |
Corporate Office Properties, L.P. [Member] | Fair value measurement on a recurring basis [Member] |  |
Assets: |  |
Interest rate derivatives | 5,617 | 3,073
Liabilities: |  |
Interest rate derivatives | 5,459 |
Corporate Office Properties, L.P. [Member] | Fair value measurement on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Interest rate derivatives | 5,617 | $ 3,073
Liabilities: |  |
Interest rate derivatives | $ 5,459 |

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