XML 105 R81.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Share-Based Compensation and Other Compensation Matters (Details 2) - Performance share units [Member] - USD ($) $ in Thousands |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 05, 2015 | Mar. 06, 2014 | Mar. 01, 2013 | Mar. 02, 2012 | Mar. 03, 2011 | Dec. 31, 2015
2011 PSU Grants [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock awards granted (in shares or units) |  |  |  |  | 56,883 |
Aggregate grant date fair value |  |  |  |  | $ 2,796 |
Unvested at the end of the period (in shares) |  |  |  |  |  | 0
2012 PSU Grants [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock awards granted (in shares or units) |  |  |  | 54,070 |  |
Aggregate grant date fair value |  |  |  | $ 1,772 |  |
Unvested at the end of the period (in shares) |  |  |  |  |  | 0
2013 PSU Grants [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock awards granted (in shares or units) |  |  | 69,579 |  |  |
Aggregate grant date fair value |  |  | $ 1,867 |  |  |
Unvested at the end of the period (in shares) |  |  |  |  |  | 51,556
2014 PSU Grants [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock awards granted (in shares or units) |  | 49,103 |  |  |  |
Aggregate grant date fair value |  | $ 1,723 |  |  |  |
Unvested at the end of the period (in shares) |  |  |  |  |  | 37,843
2015 PSU Grants [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock awards granted (in shares or units) | 45,656 |  |  |  |  |
Aggregate grant date fair value | $ 1,678 |  |  |  |  |
Unvested at the end of the period (in shares) |  |  |  |  |  | 45,656

X
- Definition The aggregate fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References No definition available. + Details
Name: | ofc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAggregateFairValue
Namespace Prefix: | ofc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=ofc_PerformanceShareUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=ofc_A2011PsuGrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=ofc_A2012PSUGrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=ofc_A2013PSUGrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=ofc_A2014PSUGrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=ofc_TwoThousandFifteenPSUGrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |