XML 79 R47.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |  |
Impairment losses (recoveries) | $ 16,300 |  | $ 46,096 |  | $ 16,300 |  | $ 41,260 |
Exit costs on property dispositions |  |  |  |  | 186 |  | 4,066 |
Fair value measurement on a nonrecurring basis | Discontinued Operations |  |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |  |
Impairment losses (recoveries) |  |  |  |  | 14,800 |  |  |
Exit costs on property dispositions |  |  |  |  | 186 |  |  |
Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |  |
Exit costs on property dispositions | 186 |  |  |  | 186 |  |  |
Properties Expected to be Conveyed | Fair value measurement on a nonrecurring basis |  |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |  |
Impairment losses (recoveries) | 10,400 |  |  |  |  |  |  |
Other Properties with Shortened Holding Periods | Fair value measurement on a nonrecurring basis |  |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |  |
Impairment losses (recoveries) | 5,900 |  |  |  |  |  |  |
Number of Properties, Shortened Holding Period | 2 |  |  |  |  |  |  |
Properties,net | Fair value measurement on a nonrecurring basis |  |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |  |
Impairment losses (recoveries) | 21,888 | [1],[2] | 52,900 | [1],[3] | 30,940 | [1],[2] | 60,593 | [1],[3]
Properties,net | Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |  |
Assets | 245,535 | [1],[4] | 369,312 | [1],[4] | 245,535 | [1],[4] | 369,312 | [1],[4]
Exit costs on property dispositions |  |  | 2,900 |  |  |  | 4,200 |
Properties,net | Fair value measurement on a nonrecurring basis | Total Estimated Fair Value |  |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |  |
Assets | $ 245,535 | [1] | $ 369,312 | [1] | $ 245,535 | [1] | $ 369,312 | [1]
[1] | Reflects balance sheet classifications of assets at time of fair value measurement, excluding the effect of held for sale classifications.
[2] | Represents impairment losses, excluding exit costs incurred of $186,000 for the three months and nine months ended September 30, 2013.
[3] | Represents impairment losses, excluding exit costs incurred of $2.9 million for the three months ended September 30, 2012 and $4.2 million for the nine months ended September 30, 2012.
[4] | These fair value measurements were developed as a result of negotiations between us and potential, or actual, purchasers of properties.

X
- Definition Number of Properties, Shortened Holding Period + References No definition available. + Details
Name: | ofc_NumberofPropertiesShortenedHoldingPeriod
Namespace Prefix: | ofc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the cash out flow for exit costs included in aggregate net impairment loss recognized during the period in connection with dispositions. + References No definition available. + Details
Name: | ofc_PaymentsOfExitCostsIncludedInImpairmentLossesInConnectionWithDispositions
Namespace Prefix: | ofc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration