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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2015
Fair Value Disclosures [Abstract] |
Schedule of fair value assets and liabilities measured on recurring basis | The tables below set forth financial assets and liabilities of COPT and its subsidiaries that are accounted for at fair value on a recurring basis as of December 31, 2015 and 2014 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
December 31, 2015: |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities in deferred compensation plan (1) |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 5,658 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,658 |
Other |  | 105 |  |  | — |  |  | — |  |  | 105 |
Interest rate derivatives (2) |  | — |  |  | 53 |  |  | — |  |  | 53 |
Total assets |  | $ | 5,763 |  |  | $ | 53 |  |  | $ | — |  |  | $ | 5,816 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan liability (3) |  | $ | — |  |  | $ | 5,763 |  |  | $ | — |  |  | $ | 5,763 |
Interest rate derivatives |  | — |  |  | 3,160 |  |  | — |  |  | 3,160 |
Total liabilities |  | $ | — |  |  | $ | 8,923 |  |  | $ | — |  |  | $ | 8,923 |
December 31, 2014: |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities in deferred compensation plan (1) |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 5,756 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,756 |
Other |  | 126 |  |  | — |  |  | — |  |  | 126 |
Interest rate derivatives (2) |  | — |  |  | 274 |  |  | — |  |  | 274 |
Total assets |  | $ | 5,882 |  |  | $ | 274 |  |  | $ | — |  |  | $ | 6,156 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan liability (3) |  | $ | — |  |  | $ | 5,882 |  |  | $ | — |  |  | $ | 5,882 |
Interest rate derivatives |  | — |  |  | 1,855 |  |  | — |  |  | 1,855 |
Total liabilities |  | $ | — |  |  | $ | 7,737 |  |  | $ | — |  |  | $ | 7,737 |
(1) Included in the line entitled “restricted cash and marketable securities” on COPT’s consolidated balance sheet. (2) Included in the line entitled “prepaid expenses and other assets” on COPT’s consolidated balance sheet. (3) Included in the line entitled “other liabilities” on COPT’s consolidated balance sheet. The tables below set forth financial assets and liabilities of COPLP and its subsidiaries that are accounted for at fair value on a recurring basis as of December 31, 2015 and 2014 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
December 31, 2015: |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (1) |  | $ | — |  |  | $ | 53 |  |  | $ | — |  |  | $ | 53 |
Total Assets |  | $ | — |  |  | $ | 53 |  |  | $ | — |  |  | $ | 53 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives |  | $ | — |  |  | $ | 3,160 |  |  | $ | — |  |  | $ | 3,160 |
December 31, 2014: |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (1) |  | $ | — |  |  | $ | 274 |  |  | $ | — |  |  | $ | 274 |
Total Assets |  | $ | — |  |  | $ | 274 |  |  | $ | — |  |  | $ | 274 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives |  | $ | — |  |  | $ | 1,855 |  |  | $ | — |  |  | $ | 1,855 |
(1) Included in the line entitled “prepaid expenses and other assets” on COPLP’s consolidated balance sheet.
Schedule of fair value hierarchy of impaired properties and other assets associated with such properties | The table below sets forth the fair value hierarchy of the valuation technique we used to determine nonrecurring fair measurements of assets as of December 31, 2015 (dollars in thousands):
|  | Fair Values as of December 31, 2015 |
|  | Quoted Prices in |  |  |  | Significant |  |  |
|  | Active Markets for |  | Significant Other |  | Unobservable |  |  |
|  | Identical Assets |  | Observable Inputs |  | Inputs |  |  |
Description |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Total properties, net (1) |  | $ | — |  |  | $ | — |  |  | $ | 13,850 |  |  | $ | 13,850 |  |
Assets held for sale, net (2) |  | — |  |  | — |  |  | 21,423 |  |  | 21,423 |  |
(1) Represents estimated fair values. (2) Represents estimated fair values less costs to sell.
Schedule of quantitative information about significant unobservable inputs used for Level 3 fair value measurements | The table below sets forth quantitative information about significant unobservable inputs used for the Level 3 fair value measurements reported above as of December 31, 2015 (dollars in thousands):
Valuation Technique |  | Fair Values on Measurement Date |  | Unobservable Input |  | Range (Weighted Average) (1)
Bids for property indicative of value |  | $ | 24,423 |  |  | Indicative bids |  | N/A
Comparable sales analysis |  | 10,850 |  |  | Comparable sales prices |  | N/A
(1) Only one value applied for these unobservable inputs.

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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets and liabilities. This disclosure may include, but is not limited to, the fair value of the asset and liabilities, valuation technique used to measure the fair value, the inputs used to measure fair value, the ranges of the inputs and the weighted averages of the inputs. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19296-110258 + Details
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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=36462937&loc=d3e19190-110258 + Details
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