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Properties, net (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Properties |  |
Projects in development or held for future development | $ 545,426 us-gaap_DevelopmentInProcess | $ 511,608 us-gaap_DevelopmentInProcess
Projects in development or held for future development | Land in development or held for future development |  |
Properties |  |
Projects in development or held for future development | 214,977 us-gaap_DevelopmentInProcess / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ofc_LandInDevelopmentOrHeldForFutureDevelopmentMember / ofc_RealEstatePropertiesStatusAxis = ofc_ProjectsInDevelopmentOrHeldForFutureDevelopmentMember | 245,676 us-gaap_DevelopmentInProcess / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ofc_LandInDevelopmentOrHeldForFutureDevelopmentMember / ofc_RealEstatePropertiesStatusAxis = ofc_ProjectsInDevelopmentOrHeldForFutureDevelopmentMember
Projects in development or held for future development | Construction in progress, excluding land |  |
Properties |  |
Projects in development or held for future development | $ 330,449 us-gaap_DevelopmentInProcess / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember / ofc_RealEstatePropertiesStatusAxis = ofc_ProjectsInDevelopmentOrHeldForFutureDevelopmentMember | $ 265,932 us-gaap_DevelopmentInProcess / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember / ofc_RealEstatePropertiesStatusAxis = ofc_ProjectsInDevelopmentOrHeldForFutureDevelopmentMember

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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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