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Prepaid Expenses and Other Assets (Details 2) (USD $) | Dec. 31, 2011 | Dec. 31, 2010
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Mortgage and other investing receivables |  |
Mortgage and other investing receivables | $ 27,998,000 | $ 18,870,000
Fair value of mortgage and other investing receivables | 28,000,000 | 18,800,000
Notes receivable from City of Huntsville |  |
Mortgage and other investing receivables |  |
Mortgage and other investing receivables | 17,741,000 | 4,643,000
Mortgage loans receivable |  |
Mortgage and other investing receivables |  |
Mortgage and other investing receivables | 10,257,000 | 14,227,000
Number of mortgage loans receivable | 2 |
Operating notes receivable |  |
Operating Notes Receivable |  |
Operating notes receivables due from tenants with terms exceeding one year | $ 530,000 | $ 655,000

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- Definition An amount classified as an investment activity representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | ofc_
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Balance Type: | na
Period Type: | duration

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- Definition Represents the number of loans secured by properties included in mortgage loans receivable. + References No definition available. + Details
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Namespace Prefix: | ofc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | ofc_
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Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of operating notes receivables due from tenants with terms exceeding one year. + References No definition available. + Details
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Namespace Prefix: | ofc_
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Loan -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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