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Deferred Leasing and Financing Costs (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred Leasing and Financing Costs [Abstract] |  |
Deferred leasing costs | $ 123,925 us-gaap_DeferredCostsLeasingGross | $ 110,711 us-gaap_DeferredCostsLeasingGross
Deferred financing costs | 31,229 us-gaap_DeferredFinanceCostsGross | 36,390 us-gaap_DeferredFinanceCostsGross
Accumulated amortization | (90,357)ofc_DeferredLeasingAndFinancingCostsAccumulatedAmortization | (80,834)ofc_DeferredLeasingAndFinancingCostsAccumulatedAmortization
Deferred leasing and financing costs, net | $ 64,797 us-gaap_DeferredCostsCurrentAndNoncurrent | $ 66,267 us-gaap_DeferredCostsCurrentAndNoncurrent

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- Details
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Namespace Prefix: | ofc_
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- Definition For an unclassified balance sheet, the accumulated amortization, as of the reporting date, associated with deferred leasing costs and deferred finance costs. + References No definition available. + Details
Name: | ofc_DeferredLeasingAndFinancingCostsAccumulatedAmortization
Namespace Prefix: | ofc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The carrying amount of deferred costs. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition For an unclassified balance sheet, this element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This amount is before considering accumulated amortization representing the periodic charge to earnings to recognize the deferred costs over the term of the related lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40246-112709 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40588-112709 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant