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Debt (Details 3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Carrying amount and estimated fair value of debt |  |
Debt, net | $ 1,920,057 us-gaap_LongTermDebt | $ 1,927,703 us-gaap_LongTermDebt
Senior Notes |  |
Carrying amount and estimated fair value of debt |  |
Debt, net | 890,900 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |
4.25% Exchangeable Senior Notes |  |
Carrying amount and estimated fair value of debt |  |
Debt, net | 572 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = ofc_Exchangeable425PercentSeniorNotesMember | 563 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = ofc_Exchangeable425PercentSeniorNotesMember
Carrying Amount |  |
Carrying amount and estimated fair value of debt |  |
Variable-rate debt | 639,877 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 657,691 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Debt, net | 1,920,057 us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 1,927,703 us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Carrying Amount | Senior Notes |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | 890,862 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 592,689 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Carrying Amount | 4.25% Exchangeable Senior Notes |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | 572 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = ofc_Exchangeable425PercentSeniorNotesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 563 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = ofc_Exchangeable425PercentSeniorNotesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Carrying Amount | Fixed-rate debt excluding other fixed rate debt not separately disclosed |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | 388,746 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = ofc_OtherFixedRateDebtMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 676,760 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = ofc_OtherFixedRateDebtMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Total Estimated Fair Value |  |
Carrying amount and estimated fair value of debt |  |
Variable-rate debt | 642,091 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 657,527 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Debt, net | 1,900,067 us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 1,884,473 us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Total Estimated Fair Value | Senior Notes |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | 901,599 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 575,374 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Total Estimated Fair Value | 4.25% Exchangeable Senior Notes |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | 575 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = ofc_Exchangeable425PercentSeniorNotesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 575 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = ofc_Exchangeable425PercentSeniorNotesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Total Estimated Fair Value | Fixed-rate debt excluding other fixed rate debt not separately disclosed |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | $ 355,802 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = ofc_OtherFixedRateDebtMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | $ 650,997 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = ofc_OtherFixedRateDebtMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember

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