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v2.4.1.9

Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Allowance for doubtful accounts- AR | $ 717 us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 2,976 us-gaap_AllowanceForDoubtfulAccountsReceivable
Allowance for deferred rent receivable | 1,418 ofc_AllowanceforDoubtfulAccountsDeferredRent | 2,126 ofc_AllowanceforDoubtfulAccountsDeferredRent
Common Shares of beneficial interest, par value (in dollars per share) | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Common Shares of beneficial interest, shares authorized | 125,000,000 us-gaap_CommonStockSharesAuthorized | 125,000,000 us-gaap_CommonStockSharesAuthorized
Common Shares of beneficial interest, shares issued | 93,255,284 us-gaap_CommonStockSharesIssued | 87,394,512 us-gaap_CommonStockSharesIssued
Common Shares of beneficial interest, shares outstanding | 93,255,284 us-gaap_CommonStockSharesOutstanding | 87,394,512 us-gaap_CommonStockSharesOutstanding
Corporate Office Properties, L.P. |  |
Allowance for doubtful accounts- AR | 717 us-gaap_AllowanceForDoubtfulAccountsReceivable / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,976 us-gaap_AllowanceForDoubtfulAccountsReceivable / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Allowance for deferred rent receivable | $ 1,418 ofc_AllowanceforDoubtfulAccountsDeferredRent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 2,126 ofc_AllowanceforDoubtfulAccountsDeferredRent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
General Partner | Corporate Office Properties, L.P. |  |
Preferred Units, Outstanding | 7,431,667 us-gaap_PreferredUnitsOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember | 9,431,667 us-gaap_PreferredUnitsOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember
Common Shares of beneficial interest, shares outstanding | 93,255,284 us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember | 87,394,512 us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember
Limited Partner | Corporate Office Properties, L.P. |  |
Preferred Units, Outstanding | 352,000 us-gaap_PreferredUnitsOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember | 352,000 us-gaap_PreferredUnitsOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Common Shares of beneficial interest, shares outstanding | 3,837,551 us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember | 3,977,700 us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember

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