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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Schedule of fair value assets and liabilities measured on recurring basis | The table below sets forth financial assets and liabilities of COPT and its subsidiaries that are accounted for at fair value on a recurring basis as of March 31, 2018 and the hierarchy level of inputs used in measuring their respective fair values under applicable accounting standards (in thousands):
Description |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs(Level 2) |  | Significant Unobservable Inputs(Level 3) |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities in deferred compensation plan (1) |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 4,433 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,433 |
Other |  | 48 |  |  | — |  |  | — |  |  | 48 |
Interest rate derivatives (1) |  | — |  |  | 7,960 |  |  | — |  |  | 7,960 |
Total assets |  | $ | 4,481 |  |  | $ | 7,960 |  |  | $ | — |  |  | $ | 12,441 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan liability (2) |  | $ | — |  |  | $ | 4,481 |  |  | $ | — |  |  | $ | 4,481 |
(1) Included in the line entitled “prepaid expenses and other assets, net” on COPT’s consolidated balance sheet. (2) Included in the line entitled “other liabilities” on COPT’s consolidated balance sheet. The table below sets forth financial assets and liabilities of COPLP and its subsidiaries that are accounted for at fair value on a recurring basis as of March 31, 2018 and the hierarchy level of inputs used in measuring their respective fair values under applicable accounting standards (in thousands):
Description |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs(Level 2) |  | Significant Unobservable Inputs(Level 3) |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (1) |  | $ | — |  |  | $ | 7,960 |  |  | $ | — |  |  | $ | 7,960 |
(1) Included in the line entitled “prepaid expenses and other assets, net” on COPLP’s consolidated balance sheet.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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