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Fair Value Measurements (Details 2) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Liabilities: |  |
Interest rate derivatives | $ 3,160 | $ 1,855
Fair value measurement on a recurring basis [Member] |  |
Assets: |  |
Interest rate derivatives | 53 | 274
Assets | 5,816 | 6,156
Liabilities: |  |
Deferred compensation plan liability | 5,763 | 5,882
Interest rate derivatives | 3,160 | 1,855
Liabilities | 8,923 | 7,737
Fair value measurement on a recurring basis [Member] | Mutual funds [Member] |  |
Assets: |  |
Marketable securities in deferred compensation plan | 5,658 | 5,756
Fair value measurement on a recurring basis [Member] | Other [Member] |  |
Assets: |  |
Marketable securities in deferred compensation plan | 105 | 126
Fair value measurement on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets: |  |
Assets | 5,763 | 5,882
Liabilities: |  |
Liabilities | 0 | 0
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 | 5,658 | 5,756
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 | 105 | 126
Fair value measurement on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Interest rate derivatives | 53 | 274
Assets | 53 | 274
Liabilities: |  |
Deferred compensation plan liability | 5,763 | 5,882
Interest rate derivatives | 3,160 | 1,855
Liabilities | 8,923 | 7,737
Corporate Office Properties, L.P. [Member] |  |
Liabilities: |  |
Interest rate derivatives | 3,160 | 1,855
Corporate Office Properties, L.P. [Member] | Fair value measurement on a recurring basis [Member] |  |
Assets: |  |
Interest rate derivatives | 53 | 274
Assets | 53 | 274
Liabilities: |  |
Interest rate derivatives | 3,160 | 1,855
Corporate Office Properties, L.P. [Member] | Fair value measurement on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets: |  |
Assets | 0 | 0
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 | 53 | 274
Assets | 53 | 274
Liabilities: |  |
Interest rate derivatives | $ 3,160 | $ 1,855

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