XML 57 R68.htm IDEA: XBRL DOCUMENT
v3.2.0.727

Commitments and Contingencies (Details) | Jun. 30, 2015 USD ($) Property | Aug. 31, 2010 USD ($)
--- | --- | ---
Tax incremental financing obligation |  |
Liability recognized with regard to tax incremental financing obligation at end of current period | $ 2,400,000 |
Environmental Indemnity Agreement |  |
Number of lease properties which were provided environmental indemnifications | Property | 3 |
Environmental indemnification to the tenant against losses covered under prior owner's indemnity agreement | $ 5,000,000.0 |
Maximum environmental indemnification to the tenant against consequential damages after acquisition of property | $ 12,500,000.0 |
Additional costs agreed to be paid by the entity related to construction and environmental regulatory activities (as a percent) | 50.00% |
Maximum annual additional costs agreed to be paid by the entity related to construction and environmental regulatory activities | $ 300,000 |
Maximum additional costs agreed to be paid by the entity related to construction and environmental regulatory activities | $ 1,500,000.0 |
Anne Arundel County, Maryland [Member] | Tax Incremental Financing Bond [Member] |  |
Tax incremental financing obligation |  |
Debt instrument, face amount |  | $ 30,000,000

X
- Definition Represents the maximum annual additional costs agreed to be paid by the entity related to the construction and environmental regulatory activities incurred by the tenant as a result of the indemnified environmental condition of the properties. + References No definition available. + Details
Name: | ofc_AdditionalCostsIncurredRelatedToConstructionAndEnvironmentalRegulatoryActivitiesMaximumPerAnnum
Namespace Prefix: | ofc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the percentage of additional costs agreed to be paid by the entity related to the construction and environmental regulatory activities incurred by the tenant as a result of the indemnified environmental condition of the properties, subject to an annual and aggregate limits. + References No definition available. + Details
Name: | ofc_AdditionalCostsIncurredRelatedToConstructionAndEnvironmentalRegulatoryActivitiesPercentage
Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the maximum amount of environmental indemnification to the tenant against consequential damages after the acquisition of the property from the entity. + References No definition available. + Details
Name: | ofc_EnvironmentalIndemnificationToTenantAgainstConsequentialDamagesAfterAcquisitionOfPropertyMaximum
Namespace Prefix: | ofc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the maximum amount of environmental indemnification to the tenant against losses covered under an indemnity agreement of the prior owner of the property after the State of New Jersey declares the remediation complete. + References No definition available. + Details
Name: | ofc_EnvironmentalIndemnificationToTenantAgainstLossesCoveredUnderPriorOwnerIndemnityAgreementMaximum
Namespace Prefix: | ofc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | ofc_EnvironmentalIndemnityAgreementAbstract
Namespace Prefix: | ofc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum additional costs agreed to be paid by the entity related to the construction and environmental regulatory activities incurred by the tenant as a result of the indemnified environmental condition of the properties. + References No definition available. + Details
Name: | ofc_MaximumAdditionalCostsIncurredRelatedToConstructionAndEnvironmentalRegulatoryActivities
Namespace Prefix: | ofc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the number of lease properties in New Jersey which were provided environmental indemnifications by the entity. + References No definition available. + Details
Name: | ofc_PropertySubjectToEnvironmentalIndemnityLeaseAgreementNumberOfProperties
Namespace Prefix: | ofc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | ofc_TaxIncrementalFinancingObligationAbstract
Namespace Prefix: | ofc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsCurrentCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_StatementGeographicalAxis=ofc_AnneArundelCountyMarylandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=ofc_TaxIncrementalFinancingBondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |