XML 86 R57.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Fair Value Measurements (Details 3) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) Property | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses |  |  |  |  | $ 101,391 | $ 23,289 | $ 1,416
Assets held for sale, net | $ 94,654 |  |  |  | 94,654 | 96,782 |
Held-for-sale [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Assets held for sale, net | 94,654 |  |  |  | 94,654 | 96,782 |
Fort Meade/BW Corridor [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Number of properties | Property |  |  |  | 2 |  |  |
Fair value measurement on a nonrecurring basis [Member] | Operating properties, net [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  | $ 1,400
Fair value measurement on a nonrecurring basis [Member] | Held-for-sale [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses |  | $ 11,500 |  | $ 2,400 |  |  |
Assets held for sale, net | 94,700 | 161,500 | $ 300,600 | $ 225,900 | 94,700 | 96,800 |
Fair Values on Measurement Date | 79,685 |  |  |  | 79,685 |  |
Fair value measurement on a nonrecurring basis [Member] | Held-for-sale [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Fair Values on Measurement Date | 79,685 |  |  |  | $ 79,685 |  |
Fair value measurement on a nonrecurring basis [Member] | Disposed of by sale [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses | 300 |  |  |  |  |  |
Transaction value of operating property dispositions | 54,100 | 210,700 |  |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Northern Virginia Defense/IT and Fort Meade/Baltimore Washington Corridor [Member] | Held-for-sale [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses |  |  | 14,100 |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Defense/Information Technology Sector [Member] | Northern Virginia Defense/IT [Member] | Held-for-sale [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses |  | 13,300 |  |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Aberdeen, Maryland [Member] | Land in development or held for future development [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses |  |  | 4,400 |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Aberdeen, Maryland [Member] | Operating properties, net [Member] | Land in development or held for future development [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  | 6,600 |
Fair value measurement on a nonrecurring basis [Member] | Aberdeen, Maryland [Member] | Other Segments [Member] | Operating properties, net [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses |  |  | 34,400 |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Frederick, Maryland [Member] | Land in development or held for future development [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses |  |  | 8,200 |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Greater Philadelphia [Member] | Regional Office [Member] | Held-for-sale [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses |  |  | 6,200 |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Colorado Springs, Colorado and White Marsh, Maryland [Member] | Regional Office [Member] | Held-for-sale [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses |  |  | $ 2,400 |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | Colorado Springs [Member] | Held-for-sale [Member] | Land in development or held for future development [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  | 12,800 |
Fair value measurement on a nonrecurring basis [Member] | White Marsh, Maryland [Member] | Held-for-sale [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses | $ 1,300 | 10,000 |  |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | White Marsh, Maryland [Member] | Held-for-sale [Member] | Land in development or held for future development [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses |  | $ 2,900 |  |  |  |  |
Fair value measurement on a nonrecurring basis [Member] | White Marsh, Maryland [Member] | Regional Office [Member] | Held-for-sale [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  | 2,600 |
Fair value measurement on a nonrecurring basis [Member] | Northern Virginia [Member] | Regional Office [Member] | Held-for-sale [Member] | Operating properties, net [Member] |  |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  | $ 1,300 |

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 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=68055307&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=66902209&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=66048111&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=64862545&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=65878427&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=64827811&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=65878427&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 Revenue from the sale of commercial, industrial, or residential property during the period. This element is more likely than not relevant to an entity for which real estate operations are a principal activity. If real estate operations are not a principal activity, the reporting entity would likely use a gain (loss) on sale of property, plant, or equipment type element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_SalesOfRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis=ofc_RealEstateInvestmentPropertiesNetMember
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: | us-gaap_SubsegmentsAxis=ofc_NorthernVirginiaMember
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: | 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_ColoradoSpringsColoradoandWhiteMarshMarylandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentGeographicRegionAxis=ofc_ColoradoSpringsColoradoMember
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: |

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