XML 59 R41.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Fair Value Measurements (Details 3) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) Property | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |
Impairment losses | $ 27,699 |  |  | $ 2,307 | $ 99,837 | $ 3,545 |
Assets held for sale, net | 161,454 |  |  |  | 161,454 |  | $ 96,782
Assets held for sale, net |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |
Assets held for sale, net | 161,454 |  |  |  | 161,454 |  | 96,782
Fort Meade/BW Corridor |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |
Number of properties | Property |  |  | 2 |  |  |  |
Fair value measurement on a nonrecurring basis | Assets held for sale, net |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |
Properties held-for-sale |  |  |  |  |  |  | $ 96,800
Impairment losses | 11,500 |  | $ 2,400 |  |  |  |
Assets held for sale, net | 161,454 | $ 300,600 | $ 225,900 |  | 161,454 |  |
Fair Values on Measurement Date | 127,128 |  |  |  | 127,128 |  |
Fair value measurement on a nonrecurring basis | Assets held for sale, net | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |
Fair Values on Measurement Date | 127,128 |  |  |  | $ 127,128 |  |
Fair value measurement on a nonrecurring basis | Assets disposed of by sale |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |
Transaction Value | 210,700 |  |  |  |  |  |
Fair value measurement on a nonrecurring basis | Northern Virginia Defense/IT and Fort Meade/BW Corridor | Assets held for sale, net |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |
Impairment losses |  | 14,100 |  |  |  |  |
Fair value measurement on a nonrecurring basis | Defense/Information Technology Locations | Fort Meade/BW Corridor | Assets held for sale, net |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |
Impairment losses | 13,300 |  |  |  |  |  |
Fair value measurement on a nonrecurring basis | Aberdeen, Maryland | Land in development or held for future development |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |
Impairment losses |  | 4,400 |  |  |  |  |
Fair value measurement on a nonrecurring basis | Aberdeen, Maryland | Other Segments | Operating properties, net |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |
Impairment losses |  | 34,400 |  |  |  |  |
Fair value measurement on a nonrecurring basis | Frederick, Maryland | Land in development or held for future development |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |
Impairment losses |  | 8,200 |  |  |  |  |
Fair value measurement on a nonrecurring basis | Greater Philadelphia, Pennsylvania | Regional Office | Assets held for sale, net |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |
Impairment losses |  | $ 6,200 |  |  |  |  |
Fair value measurement on a nonrecurring basis | White Marsh, Maryland | Assets held for sale, net |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |
Impairment losses | 10,000 |  |  |  |  |  |
Fair value measurement on a nonrecurring basis | White Marsh, Maryland | Assets held for sale, net | Land in development or held for future development |  |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |  |
Impairment losses | $ 2,900 |  |  |  |  |  |

X
- Definition Number of Properties Reclassified To Held-For-Sale + References No definition available. + Details
Name: | ofc_NumberofPropertiesReclassifiedToHeldForSale
Namespace Prefix: | ofc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the total transaction value of operating property dispositions during the period. + References No definition available. + Details
Name: | ofc_TransactionValueofOperatingPropertyDispositions
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 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228 Reference 2: 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=56944662&loc=d3e3602-108585 + 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=36462937&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount classified as assets attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51716988&loc=d3e1107-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721673-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721533-107759 + Details
Name: | us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents properties which were acquired directly or through foreclosure for which a committed plan to sell exists and an active program to market such properties has been initiated. + References No definition available. + Details
Name: | us-gaap_InventoryRealEstateHeldForSale
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=ofc_FortMeadeandBaltimoreWashingtonCorridorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=ofc_NorthernVirginiaDefenseITandFortMeadeBaltimoreWashingtonCorridorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ofc_DefenseandTechnologyLocationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentGeographicRegionAxis=ofc_AberdeenMarylandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ofc_LandInDevelopmentOrHeldForFutureDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_AllOtherSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis=ofc_RealEstateInvestmentPropertiesNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentGeographicRegionAxis=ofc_FrederickMarylandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentGeographicRegionAxis=ofc_GreaterPhiladelphiaPennsylvaniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ofc_RegionalOfficeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentGeographicRegionAxis=ofc_WhiteMarshMarylandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |