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Mortgage and Other Investing Receivables (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Mortgage and other investing receivables | $ 55,231 | $ 53,663
Notes Receivable from City of Huntsville |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Mortgage and other investing receivables | 45,381 | 44,055
Mortgage Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Mortgage and other investing receivables | $ 9,850 | $ 9,608
Number of mortgage loans receivable | 1 |

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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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- 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: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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