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Debt (Details 2) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Carrying amount and estimated fair value of debt |  |
Carrying Value | $ 1,999,622 us-gaap_LongTermDebt | $ 1,920,057 us-gaap_LongTermDebt
4.25% Exchangeable Senior Notes |  |
Carrying amount and estimated fair value of debt |  |
Carrying Value | 575 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = ofc_Exchangeable425PercentSeniorNotesMember | 572 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = ofc_Exchangeable425PercentSeniorNotesMember
Carrying Amount |  |
Carrying amount and estimated fair value of debt |  |
Variable-rate debt | 720,668 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 639,877 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Carrying Value | 1,999,622 us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 1,920,057 us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Carrying Amount | Unsecured senior notes |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | 891,103 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 890,862 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 | 575 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = ofc_Exchangeable425PercentSeniorNotesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 572 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = ofc_Exchangeable425PercentSeniorNotesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Carrying Amount | Other fixed-rate debt |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | 387,276 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = ofc_OtherFixedRateDebtMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 388,746 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 | 722,752 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 642,091 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Carrying Value | 1,992,236 us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 1,900,067 us-gaap_LongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Total Estimated Fair Value | Unsecured senior notes |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | 918,074 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 901,599 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 | Other fixed-rate debt |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | $ 350,835 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = ofc_OtherFixedRateDebtMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | $ 355,802 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = ofc_OtherFixedRateDebtMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References No definition available. + Details
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- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References No definition available. + Details
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