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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  | 9 Months Ended
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Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Sep. 30, 2013 Corporate Office Properties, L.P. | Dec. 31, 2012 Corporate Office Properties, L.P. | Sep. 30, 2013 Fair value measurement on a recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) | Sep. 30, 2013 Fair value measurement on a recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) Corporate Office Properties, L.P. | Sep. 30, 2013 Fair value measurement on a recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) Mutual funds | Sep. 30, 2013 Fair value measurement on a recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) Common Shares | Sep. 30, 2013 Fair value measurement on a recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) Other | Sep. 30, 2013 Fair value measurement on a recurring basis Significant Other Observable Inputs (Level 2) | Sep. 30, 2013 Fair value measurement on a recurring basis Significant Other Observable Inputs (Level 2) Corporate Office Properties, L.P. | Sep. 30, 2013 Fair value measurement on a recurring basis Significant Unobservable Inputs (Level 3) | Sep. 30, 2013 Fair value measurement on a recurring basis Significant Unobservable Inputs (Level 3) Corporate Office Properties, L.P. | Sep. 30, 2013 Fair value measurement on a recurring basis Total Estimated Fair Value | Sep. 30, 2013 Fair value measurement on a recurring basis Total Estimated Fair Value Corporate Office Properties, L.P. | Sep. 30, 2013 Fair value measurement on a recurring basis Total Estimated Fair Value Mutual funds | Sep. 30, 2013 Fair value measurement on a recurring basis Total Estimated Fair Value Common Shares | Sep. 30, 2013 Fair value measurement on a recurring basis Total Estimated Fair Value Other | Sep. 30, 2013 Redeemable Noncontrolling Interest Minimum Fair value measurement on a recurring basis Significant Unobservable Inputs (Level 3) | Sep. 30, 2013 Redeemable Noncontrolling Interest Maximum Fair value measurement on a recurring basis Significant Unobservable Inputs (Level 3) | Sep. 30, 2013 Redeemable Noncontrolling Interest Weighted Average Fair value measurement on a recurring basis Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities in deferred compensation plan |  |  |  |  |  |  |  |  |  | $ 6,753 | [1] | $ 217 | [1] | $ 211 | [1] |  |  |  |  |  |  |  |  |  |  | $ 6,753 | [1] | $ 217 | [1] | $ 211 | [1] |  |  |
Common stock |  |  |  |  |  | 520 | [1] | 520 | [2] |  |  |  |  |  |  |  |  |  |  |  |  | 520 | [1] | 520 | [2] |  |  |  |  |  |  |  |  |
Interest rate derivatives | 1,600 | (6,185) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,195 | [3] | 5,195 | [4] |  |  | 5,195 | [3] | 5,195 | [4] |  |  |  |  |  |  |  |  |
Warrants to purchase common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 301 | [3] | 301 | [4] |  |  | 301 | [3] | 301 | [4] |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  | 7,701 |  | 520 |  |  |  |  |  |  |  | 5,496 |  | 5,496 |  | 0 | 0 | 13,197 |  | 6,016 |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan liability |  |  |  |  |  | 7,181 | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,181 | [5] |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 3,595 | 6,185 |  | 3,595 | 6,185 |  |  |  |  |  |  |  |  |  |  | 3,595 |  | 3,595 |  |  |  | 3,595 |  | 3,595 |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  | 7,181 |  |  |  |  |  |  |  |  |  | 3,595 |  |  |  |  |  | 10,776 |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest | $ 16,789 | $ 10,298 | $ 9,932 | $ 16,789 | $ 10,298 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,789 | $ 16,789 | $ 16,789 |  | $ 16,789 |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 20.00% | 15.30%
[1] | Included in the line entitled “restricted cash and marketable securities” on COPT’s consolidated balance sheet.
[2] | Included in the line entitled “restricted cash and marketable securities” on COPLP’s consolidated balance sheet.
[3] | Included in the line entitled “prepaid expenses and other assets” on COPT’s consolidated balance sheet.
[4] | Included in the line entitled “prepaid expenses and other assets” on COPLP’s consolidated balance sheet.
[5] | Included in the line entitled “other liabilities” on COPT’s consolidated balance sheet.

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