XML 67 R65.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Real Estate Joint Ventures (Details 2) (USD $) |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 LW Redstone Company, LLC | Dec. 31, 2011 LW Redstone Company, LLC Maximum | Dec. 31, 2011 M Square Associates, LLC
Investments in real estate joint ventures |  |  |  |  |
Percentage of residual amounts distributed to each member |  |  |  |  | 50.00%
Percentage of distributable cash in excess of preferred returns entitled to the entity |  |  | 85.00% |  |
Infrastructure costs anticipated to be funded by entity for reimbursement by the City of Huntsville (in dollars) |  |  |  | $ 76,000,000 |
Amounts advanced to fund Huntsville infrastructure costs | $ 27,998,000 | $ 18,870,000 | $ 17,700,000 |  |

X
- Definition Represents infrastructure costs anticipated to be funded by entity for reimbursement. + References No definition available. + Details
Name: | ofc_InfrastructureCostsAnticipatedToBeFunded
Namespace Prefix: | ofc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | ofc_MortgageAndOtherInvestingReceivables
Namespace Prefix: | ofc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the percentage of distributable cash in excess of preferred returns in the joint venture to which the entity will be entitled. + References No definition available. + Details
Name: | ofc_PercentageOfDistributableCashEntitledInExcessOfPreferredReturns
Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage in which the residual net cash flows will be distributed to each partner. + References No definition available. + Details
Name: | ofc_PercentageOfResidualNetCashFlowDistributedToEachPartner
Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ofc_RealEstateJointVentureLineItems
Namespace Prefix: | ofc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration