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Intangible Assets on Real Estate Acquisitions (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 208,067,000 us-gaap_FiniteLivedIntangibleAssetsGross |  | $ 188,467,000 us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization | 146,590,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | 144,613,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net Carrying Amount | 61,477,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 43,854,000 us-gaap_IntangibleAssetsNetExcludingGoodwill
Amortization of intangible assets | 2,600,000 us-gaap_AmortizationOfIntangibleAssets | 3,600,000 us-gaap_AmortizationOfIntangibleAssets |
Weighted average useful life | 10 years |  |
Estimated future amortization expense associated with the intangible asset categories for the next five years |  |  |
Remainder of fiscal year | 9,400,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear |  |
2016 | 11,600,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |
2017 | 9,400,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |
2018 | 6,300,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |
2019 | 5,100,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |
2020 | 3,800,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |
In-place lease value |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 133,395,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_InPlaceLeaseValueMember |  | 123,759,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_InPlaceLeaseValueMember
Accumulated Amortization | 102,019,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_InPlaceLeaseValueMember |  | 101,040,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_InPlaceLeaseValueMember
Net Carrying Amount | 31,376,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_InPlaceLeaseValueMember |  | 22,719,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_InPlaceLeaseValueMember
Weighted average useful life | 6 years |  |
Tenant relationship value |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 49,552,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 42,301,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated Amortization | 29,265,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 28,492,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Net Carrying Amount | 20,287,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 13,809,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Weighted average useful life | 8 years |  |
Below-market cost arrangements |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 12,415,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_BelowMarketCostArrangementsMember |  | 12,415,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_BelowMarketCostArrangementsMember
Accumulated Amortization | 6,154,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_BelowMarketCostArrangementsMember |  | 5,984,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_BelowMarketCostArrangementsMember
Net Carrying Amount | 6,261,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_BelowMarketCostArrangementsMember |  | 6,431,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_BelowMarketCostArrangementsMember
Weighted average useful life | 31 years |  |
Above-market leases |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 11,372,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember |  | 8,659,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember
Accumulated Amortization | 8,211,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember |  | 8,159,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember
Net Carrying Amount | 3,161,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember |  | 500,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember
Weighted average useful life | 4 years |  |
Market concentration premium |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 1,333,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_MarketConcentrationPremiumMember |  | 1,333,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_MarketConcentrationPremiumMember
Accumulated Amortization | 941,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_MarketConcentrationPremiumMember |  | 938,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_MarketConcentrationPremiumMember
Net Carrying Amount | $ 392,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_MarketConcentrationPremiumMember |  | $ 395,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_MarketConcentrationPremiumMember
Weighted average useful life | 27 years |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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