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v2.4.1.9

Debt (Details 2) (USD $) | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 01, 2011 period | Dec. 31, 2014 period | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 30, 2014
Schedule on basis of which debt matures |  |  |  |  |  |
2015 |  | $ 343,545,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths | [1] |  |  |
2016 |  | 171,399,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |  |  |
2017 |  | 339,247,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree | [2] |  |  |
2018 |  | 2,036,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |  |  |
2019 |  | 122,094,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  |  |  |
Thereafter |  | 951,489,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |  |  |
Total |  | 1,929,810,000 us-gaap_DebtInstrumentCarryingAmount | [3] |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt maturing in 2015 that may be extended for two one year periods |  | 150,000,000 ofc_LongtermDebtMaturitiesRepaymentsOfPrincipalDueintheNextTwelveMonthsAmountEligibleforOptionalExtension |  |  |  |
Number of extension option periods for year one long-term debt maturities repayments of principal | 2 ofc_NumberOfExtensionOptionPeriodsForNextTwelveMonthsLongtermDebtMaturitiesRepaymentsofPrincipal | 2 ofc_NumberOfExtensionOptionPeriodsForNextTwelveMonthsLongtermDebtMaturitiesRepaymentsofPrincipal |  |  |  |
Extension option period for portion of debt maturing in 2015 (in years) |  | 1 year |  |  |  |
Debt maturing in 2017 that may be extended for a one year period |  | 333,000,000 ofc_LongtermDebtMaturitiesRepaymentsOfPrincipalinYearThreeAmountEligibleforOptionalExtension |  |  |  |
Extension option period for portion of debt maturing in 2017 (in years) |  | 1 year |  |  |  |
Net discounts |  | 9,800,000 us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet |  |  |  |
Capitalized interest costs |  | 6,100,000 us-gaap_InterestCostsCapitalized |  | 8,800,000 us-gaap_InterestCostsCapitalized | 13,900,000 us-gaap_InterestCostsCapitalized |
Wholly Owned Subsidiary |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, net |  | $ 150,000,000 us-gaap_DebtDefaultLongtermDebtAmount / dei_LegalEntityAxis = ofc_WhollyOwnedSubsidiaryMember |  |  |  | $ 150,000,000 us-gaap_DebtDefaultLongtermDebtAmount / dei_LegalEntityAxis = ofc_WhollyOwnedSubsidiaryMember
[1] | Includes $150.0 million pertaining to a nonrecourse mortgage loan on which we defaulted on the payment terms as discussed further below. Also includes $150.0 million that may be extended for two one-year periods at our option, subject to certain conditions.
[2] | Includes $333.0 million that may be extended for one year at our option, subject to certain conditions.
[3] | Represents scheduled principal amortization and maturities only and therefore excludes net discounts of $9.8 million.

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- Definition Long-term Debt Maturities Repayments of Principal Due in the Next Twelve Months Eligible for Optional Extension + References No definition available. + Details
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- Definition Represents the period over which a portion of the debt instruments which will mature in the next 12 months following the date of the latest balance sheet presented in the financial statements may be extended at the option of the entity, subject to certain conditions. + References No definition available. + Details
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- Definition Long-term Debt Maturities Repayments Of Principal in Year Three Amount Eligible for Optional Extension + References No definition available. + Details
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- Definition Represents the period over which a portion of the debt instruments which will mature in year three following the date of the latest balance sheet presented in the financial statements may be extended at the option of the entity, subject to certain conditions. + References No definition available. + Details
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- Definition Represents the number of extension option periods pertaining to a portion of the debt instruments which will mature in next 12 twelve months following the date of the latest balance sheet presented in the financial statements that may be exercised at the option of the entity, subject to certain conditions. + References No definition available. + Details
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- Definition Amount of outstanding long-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(c)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph c -Article 4 + Details
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