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v2.4.1.9

Income Taxes (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 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
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum adjusted taxable income to be distributed to shareholders to qualify as a REIT (as a percent) |  |  |  |  |  |  |  |  | 90.00%ofc_MinimumPercentageOfTaxableIncomeToBeDistributedAsDividendToMaintainQualificationAsReit |  |
Subsequent period during which entity would be disqualified as a REIT if during any tax year entity fails to qualify as a REIT (in years) |  |  |  |  |  |  |  |  | 4 years |  |
Net income | $ 5,937 us-gaap_ProfitLoss | $ 24,548 us-gaap_ProfitLoss | $ 9,050 us-gaap_ProfitLoss | $ 5,671 us-gaap_ProfitLoss | $ 92,672 us-gaap_ProfitLoss | $ (2,000)us-gaap_ProfitLoss | $ (4,405)us-gaap_ProfitLoss | $ 15,277 us-gaap_ProfitLoss | $ 45,206 us-gaap_ProfitLoss | $ 101,544 us-gaap_ProfitLoss | $ 20,341 us-gaap_ProfitLoss
Adjustments: |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests, gross |  |  |  |  |  |  |  |  | (3,247)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisNonControllingInterestsGross | (4,061)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisNonControllingInterestsGross | (622)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisNonControllingInterestsGross
Other |  |  |  |  |  |  |  |  | 0 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisOther | 0 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisOther | 741 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisOther
Taxable income |  |  |  |  |  |  |  |  | 79,260 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisProfitLossTaxBasis | 110,656 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisProfitLossTaxBasis | 7,488 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisProfitLossTaxBasis
Corporate Office Properties, L.P. |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income | 5,937 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 24,548 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 9,050 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 5,671 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 92,672 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (2,000)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (4,405)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 15,277 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 45,206 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 101,544 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 20,341 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Adjustments: |  |  |  |  |  |  |  |  |  |  |
Rental revenue recognition |  |  |  |  |  |  |  |  | (3,932)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisRentalRevenueRecognition / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,303 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisRentalRevenueRecognition / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (10,794)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisRentalRevenueRecognition / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Compensation expense recognition |  |  |  |  |  |  |  |  | 1,912 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisCompensationExpenseRecognition / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 8,987 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisCompensationExpenseRecognition / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (2,669)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisCompensationExpenseRecognition / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Operating expense recognition |  |  |  |  |  |  |  |  | (2,260)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisOperatingExpenseRecognition / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (1,663)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisOperatingExpenseRecognition / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,158 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisOperatingExpenseRecognition / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Gain on sales of properties |  |  |  |  |  |  |  |  | (1,404)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisGainOnSalesOfProperties / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (50,860)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisGainOnSalesOfProperties / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (74,858)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisGainOnSalesOfProperties / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Impairment losses |  |  |  |  |  |  |  |  | 1,367 ofc_AssetImpairmentChargesContinuingAndNoncontinuingOperationsIncludingExitCosts / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 32,047 ofc_AssetImpairmentChargesContinuingAndNoncontinuingOperationsIncludingExitCosts / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 66,910 ofc_AssetImpairmentChargesContinuingAndNoncontinuingOperationsIncludingExitCosts / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Loss on interest rate derivatives |  |  |  |  |  |  |  |  | 0 us-gaap_GainLossOnDerivativeInstrumentsNetPretax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_GainLossOnDerivativeInstrumentsNetPretax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (29,805)us-gaap_GainLossOnDerivativeInstrumentsNetPretax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Gains from non-real estate investments |  |  |  |  |  |  |  |  | 405 ofc_ReconciliationofIncomefromBookBasistoTaxBasisGainfromNonRealEstateInvestments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 ofc_ReconciliationofIncomefromBookBasistoTaxBasisGainfromNonRealEstateInvestments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 7,854 ofc_ReconciliationofIncomefromBookBasistoTaxBasisGainfromNonRealEstateInvestments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income from service operations |  |  |  |  |  |  |  |  | (391)ofc_ReconciliationofIncomefromBookBasistoTaxBasisIncomefromServiceOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,650 ofc_ReconciliationofIncomefromBookBasistoTaxBasisIncomefromServiceOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,500 ofc_ReconciliationofIncomefromBookBasistoTaxBasisIncomefromServiceOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income tax expense |  |  |  |  |  |  |  |  | 310 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisIncomeTaxBenefitExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,978 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisIncomeTaxBenefitExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 381 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisIncomeTaxBenefitExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Depreciation and amortization |  |  |  |  |  |  |  |  | 41,500 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 20,834 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 24,804 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Interest expense |  |  |  |  |  |  |  |  | 920 ofc_ReconciliationofIncomefromBookbasistoTaxBasisInterestExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,057 ofc_ReconciliationofIncomefromBookbasistoTaxBasisInterestExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 3,978 ofc_ReconciliationofIncomefromBookbasistoTaxBasisInterestExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income from unconsolidated entities |  |  |  |  |  |  |  |  | (187)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisIncomeFromUnconsolidatedEntities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 3,148 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisIncomeFromUnconsolidatedEntities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (725)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisIncomeFromUnconsolidatedEntities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Noncontrolling interests, gross |  |  |  |  |  |  |  |  | (3,285)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisNonControllingInterestsGross / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (7,837)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisNonControllingInterestsGross / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (636)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisNonControllingInterestsGross / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Other |  |  |  |  |  |  |  |  | 2,346 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisOther / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,529 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisOther / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (70)ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisOther / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Taxable income |  |  |  |  |  |  |  |  | $ 82,507 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisProfitLossTaxBasis / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 114,717 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisProfitLossTaxBasis / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 7,369 ofc_ReconciliationOfIncomeFromBookBasisToTaxBasisProfitLossTaxBasis / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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