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Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 30, 2012 Property | Jul. 24, 2012 Property | Dec. 12, 2013 Property | Dec. 23, 2013 Property
Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from real estate operations |  |  |  |  |  |  |  |  | $ (14)us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | $ 37,636 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | $ 58,801 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  | 135 ofc_DisposalGroupIncludingDiscontinuedOperationPropertyOperatingExpense | (13,505)ofc_DisposalGroupIncludingDiscontinuedOperationPropertyOperatingExpense | (21,529)ofc_DisposalGroupIncludingDiscontinuedOperationPropertyOperatingExpense |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 ofc_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortizationForRealEstateOperations | (4,505)ofc_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortizationForRealEstateOperations | (13,939)ofc_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortizationForRealEstateOperations |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  | (3)ofc_ImpairmentOfPropertiesToBeDisposedDiscontinuedOperations | (26,190)ofc_ImpairmentOfPropertiesToBeDisposedDiscontinuedOperations | (23,232)ofc_ImpairmentOfPropertiesToBeDisposedDiscontinuedOperations |  |  |  |
General, administrative and leasing expenses |  |  |  |  |  |  |  |  | 0 ofc_DisposalGroupIncludingDiscontinuedOperationsGeneralAndAdministrativeAndLeasingExpenses | (4)ofc_DisposalGroupIncludingDiscontinuedOperationsGeneralAndAdministrativeAndLeasingExpenses | (3)ofc_DisposalGroupIncludingDiscontinuedOperationsGeneralAndAdministrativeAndLeasingExpenses |  |  |  |
Business development and land carry costs |  |  |  |  |  |  |  |  | 0 ofc_DisposalGroupIncludingDiscontinuedOperationBusinessDevelopmentAndLandCarryCosts | 0 ofc_DisposalGroupIncludingDiscontinuedOperationBusinessDevelopmentAndLandCarryCosts | (24)ofc_DisposalGroupIncludingDiscontinuedOperationBusinessDevelopmentAndLandCarryCosts |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense | (8,221)us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense | (10,397)us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense |  |  |  |
Gain on sales of real estate |  |  |  |  |  |  |  |  | 24 ofc_DiscontinuedOperationGainLossOnSaleOfRealEstate | 2,671 ofc_DiscontinuedOperationGainLossOnSaleOfRealEstate | 20,940 ofc_DiscontinuedOperationGainLossOnSaleOfRealEstate |  |  |  |
Gain (loss) on early extinguishment of debt |  |  |  |  |  |  |  |  | (116)ofc_DisposalGroupIncludingDiscontinuedOperationGainsLossesOnExtinguishmentOfDebt | 67,810 ofc_DisposalGroupIncludingDiscontinuedOperationGainsLossesOnExtinguishmentOfDebt | 1,736 ofc_DisposalGroupIncludingDiscontinuedOperationGainsLossesOnExtinguishmentOfDebt |  |  |  |
Discontinued operations | 22 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 191 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (198)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 11 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 71,907 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (12,974)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (4,502)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 1,261 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 26 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 55,692 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 12,353 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  |  |  |
Assets held for sale, net | 14,339 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation |  |  |  | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation |  |  |  | 14,339 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation |  |  |  |  |
White Marsh Portfolio Disposition Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold |  |  |  |  |  |  |  |  |  |  |  | 5 ofc_NumberOfRealEstatePropertiesSold / ofc_RealEstatePropertyDisposalAxis = ofc_WhiteMarshPortfolioDispositionPropertyMember |  |  |
July 2012 Portfolio Disposition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold |  |  |  |  |  |  |  |  |  |  |  |  | 23 ofc_NumberOfRealEstatePropertiesSold / ofc_RealEstatePropertyDisposalAxis = ofc_JulyPortfolioDispositionMember |  |
December 2013 Colorado Springs Portfolio Disposition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 ofc_NumberOfRealEstatePropertiesSold / ofc_RealEstatePropertyDisposalAxis = ofc_December2013ColoradoSpringsPortfolioDispositionMember |
Baltimore and Washington Corridor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 ofc_NumberofRealEstatePropertiesTitleTransfertoLender / ofc_RealEstatePropertyDisposalAxis = ofc_BaltimoreAndWashingtonCorridorMember
Colorado Springs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 ofc_NumberofRealEstatePropertiesTitleTransfertoLender / ofc_RealEstatePropertyDisposalAxis = ofc_ColoradoSpringsMember
Greater Baltimore |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of land parcels held-for-sale | 2 ofc_NumberofRealEstatePropertiesAssetsHeldforsale / ofc_RealEstatePropertyDisposalAxis = ofc_GreaterBaltimoreMember |  |  |  |  |  |  |  | 2 ofc_NumberofRealEstatePropertiesAssetsHeldforsale / ofc_RealEstatePropertyDisposalAxis = ofc_GreaterBaltimoreMember |  |  |  |  |  |
Assets held for sale, net | $ 14,339 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / ofc_RealEstatePropertyDisposalAxis = ofc_GreaterBaltimoreMember |  |  |  |  |  |  |  | $ 14,339 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / ofc_RealEstatePropertyDisposalAxis = ofc_GreaterBaltimoreMember |  |  |  |  |  |

X
- Definition Amount, if any, of gain on sales of real estate allocated to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References No definition available. + Details
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