XML 23 R42.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Fair Value Measurements (Details 4) (Properties on which impairment losses were recognized, USD $) | 3 Months Ended
--- | ---
Mar. 31, 2012
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements |
Fair value on measurement date | 92,176,000
Discounted cash flow |
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements |
Discount rate | 11.00%
Terminal capitalization rate | 9.00%
Market rent growth rate | 3.00%
Expense growth rate | 3.00%
Yield Analysis |
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements |
Yield | 12.00%
Market rent rate | 8.50%
Leasing costs per square foot | 20.00

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

X
- Definition The discount rate used to estimate the fair value of the related assets. + References No definition available. + Details
Name: | ofc_FairValueInputsDiscountRate
Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the expense growth rate , used as an input to measure the fair value. + References No definition available. + Details
Name: | ofc_FairValueInputsExpenseGrowthRate
Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the leasing costs per square foot, used as an input to measure fair value. + References No definition available. + Details
Name: | ofc_FairValueInputsLeasingCostsPerSquareFoot
Namespace Prefix: | ofc_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the market rent growth rate, used as an input to measure fair value. + References No definition available. + Details
Name: | ofc_FairValueInputsMarketRentGrowthRate
Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the market rent rate, used as an input to measure fair value. + References No definition available. + Details
Name: | ofc_FairValueInputsMarketRentRate
Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the terminal capitalization rate, used as an input to measure the fair value. + References No definition available. + Details
Name: | ofc_FairValueInputsTerminalCaptitalizationRate
Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the yield, used as an input to measure fair value. + References No definition available. + Details
Name: | ofc_FairValueInputsYield
Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant