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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  | 6 Months Ended
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Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Jun. 30, 2013 Corporate Office Properties, L.P. | Dec. 31, 2012 Corporate Office Properties, L.P. | Jun. 30, 2013 Fair value measurement on a recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) | Jun. 30, 2013 Fair value measurement on a recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) Corporate Office Properties, L.P. | Jun. 30, 2013 Fair value measurement on a recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) Mutual funds | Jun. 30, 2013 Fair value measurement on a recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) Common stocks | Jun. 30, 2013 Fair value measurement on a recurring basis Quoted Prices in Active Markets for Identical Assets (Level 1) Other | Jun. 30, 2013 Fair value measurement on a recurring basis Significant Other Observable Inputs (Level 2) | Jun. 30, 2013 Fair value measurement on a recurring basis Significant Other Observable Inputs (Level 2) Corporate Office Properties, L.P. | Jun. 30, 2013 Fair value measurement on a recurring basis Significant Unobservable Inputs (Level 3) | Jun. 30, 2013 Fair value measurement on a recurring basis Significant Unobservable Inputs (Level 3) Corporate Office Properties, L.P. | Jun. 30, 2013 Fair value measurement on a recurring basis Total Estimated Fair Value | Jun. 30, 2013 Fair value measurement on a recurring basis Total Estimated Fair Value Corporate Office Properties, L.P. | Jun. 30, 2013 Fair value measurement on a recurring basis Total Estimated Fair Value Mutual funds | Jun. 30, 2013 Fair value measurement on a recurring basis Total Estimated Fair Value Common stocks | Jun. 30, 2013 Fair value measurement on a recurring basis Total Estimated Fair Value Other | Jun. 30, 2013 Minimum Fair value measurement on a recurring basis Significant Unobservable Inputs (Level 3) | Jun. 30, 2013 Maximum Fair value measurement on a recurring basis Significant Unobservable Inputs (Level 3) | Jun. 30, 2013 Weighted Average Fair value measurement on a recurring basis Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities in deferred compensation plan |  |  |  |  |  |  |  |  |  | $ 6,649 | [1] | $ 216 | [1] | $ 211 | [1] |  |  |  |  |  |  |  |  |  |  | $ 6,649 | [1] | $ 216 | [1] | $ 211 | [1] |  |  |
Common stock |  |  |  |  |  | 1,825 | [1] | 1,825 | [2] |  |  |  |  |  |  |  |  |  |  |  |  | 1,825 | [1] | 1,825 | [2] |  |  |  |  |  |  |  |  |
Interest rate derivatives | 3,407 | (6,185) |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,963 | [3] | 6,963 | [4] |  |  | 6,963 | [3] | 6,963 | [4] |  |  |  |  |  |  |  |  |
Warrants to purchase common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 299 | [3] | 299 | [4] |  |  | 299 | [3] | 299 | [4] |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  | 8,901 |  | 1,825 |  |  |  |  |  |  |  | 7,262 |  | 7,262 |  |  |  | 16,163 |  | 9,087 |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan liability |  |  |  |  |  | 7,076 | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,076 | [5] |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 3,555 | 6,185 |  | 3,555 | 6,185 |  |  |  |  |  |  |  |  |  |  | 3,556 |  | 3,556 |  |  |  | 3,556 |  | 3,556 |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  | 7,076 |  |  |  |  |  |  |  |  |  | 3,556 |  |  |  |  |  | 10,632 |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest | $ 15,571 | $ 10,298 | $ 9,578 | $ 15,571 | $ 10,298 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,571 | $ 15,571 | $ 15,571 |  | $ 15,571 |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 20.00% | 15.70%
[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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