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Earnings Per Share ("EPS") and Earnings Per Unit ("EPU") (Details 2) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Conversion of common units |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 3,732 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ofc_ExchangeableCommonUnitsMember | 3,958 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ofc_ExchangeableCommonUnitsMember
Conversion of Series I Preferred Units |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 176 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ofc_WeightedAverageConvertiblePreferredUnitMember | 176 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ofc_WeightedAverageConvertiblePreferredUnitMember
Conversion of Series K Preferred Shares |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 434 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ofc_WeightedAverageConvertiblePreferredStockMember | 434 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ofc_WeightedAverageConvertiblePreferredStockMember
Weighted average restricted shares |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 400 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember | 390 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember
Weighted average options |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 474 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 588 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember
Corporate Office Properties, L.P. | Weighted average restricted shares |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 400 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 390 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Corporate Office Properties, L.P. | Weighted average options |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 474 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 588 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Corporate Office Properties, L.P. | Conversion of Series I preferred units |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 176 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ofc_SeriesIPreferredUnitsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 176 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ofc_SeriesIPreferredUnitsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Corporate Office Properties, L.P. | Conversion of Series K preferred units |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 434 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ofc_SeriesKPreferredUnitsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 434 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ofc_SeriesKPreferredUnitsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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