XML 100 R84.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Share-Based Compensation and Employee Benefit Plans (Details 2) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Stock Options |  |  |  |  |  |  |
Exercised (in shares) | (39,331) |  | (61,624) |  | (191,264) |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Increase (decrease) in tax benefit from share-based compensation | $ (122,000) |  | $ 43,000 |  | $ 47,000 |  |
Options |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) | 798,210 |  | 945,422 |  | 1,188,284 |  |
Forfeited/Expired (in shares) | (117,952) |  | (85,588) |  | (51,598) |  |
Exercised (in shares) | (39,331) |  | (61,624) |  | (191,264) |  |
Outstanding at the end of the period (in shares) | 640,927 |  | 798,210 |  | 945,422 |  | 1,188,284
Exercisable at the end of the period (in shares) | 640,927 | [1] | 798,210 | [2] | 945,422 | [3] |
Exercise price range, options outstanding, low end of range (in dollars per share) | $ 19.63 |  | $ 13.60 |  | $ 13.40 |  | $ 9.54
Exercise price range, options outstanding, high end of range (in dollars per share) | $ 56.00 |  | $ 57.00 |  | $ 57.00 |  | $ 57.00
Weighted Average Exercise Price per Share |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 37.62 |  | $ 36.63 |  | $ 33.07 |  |
Forfeited/Expired (in dollars per share) | $ 40.91 |  | $ 42.98 |  | $ 42.82 |  |
Exercised (in dollars per share) | $ 19.67 |  | $ 15.08 |  | $ 12.82 |  |
Outstanding at the end of the period (in dollars per share) | $ 38.11 |  | $ 37.62 |  | $ 36.63 |  | $ 33.07
Exercisable at the end of the period (in dollars per share) | $ 38.11 | [1] | $ 37.62 | [2] | $ 36.63 | [3] |
Weighted Average Remaining Contractual Term |  |  |  |  |  |  |
Weighted average remaining contractual term | 2 years |  | 3 years |  | 4 years |  | 5 years
Aggregate Intrinsic Value |  |  |  |  |  |  |
Balance outstanding | 68,000 |  | 325,000 |  | 510,000 |  | 7,987,000
Aggregate intrinsic value of options exercised | 258,000 |  | 553,000 |  | 4,000,000 |  |
Options | Range of Exercise Price One | Vested |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |
Exercisable at the end of the period (in shares) | 171,288 |  | 9,500 |  | 53,957 |  |
Exercise price range, options outstanding, low end of range (in dollars per share) | $ 19.63 |  | $ 13.60 |  | $ 13.40 |  |
Exercise price range, options outstanding, high end of range (in dollars per share) | $ 30.04 |  | $ 16.73 |  | $ 16.73 |  |
Options | Range of Exercise Price Two | Vested |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |
Exercisable at the end of the period (in shares) | 145,187 |  | 204,736 |  | 225,903 |  |
Exercise price range, options outstanding, low end of range (in dollars per share) | $ 30.05 |  | $ 16.74 |  | $ 16.74 |  |
Exercise price range, options outstanding, high end of range (in dollars per share) | $ 41.28 |  | $ 30.04 |  | $ 30.04 |  |
Options | Range of Exercise Price Three | Vested |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |
Exercisable at the end of the period (in shares) | 160,402 |  | 180,962 |  | 198,762 |  |
Exercise price range, options outstanding, low end of range (in dollars per share) | $ 41.29 |  | $ 30.05 |  | $ 30.05 |  |
Exercise price range, options outstanding, high end of range (in dollars per share) | $ 42.74 |  | $ 41.28 |  | $ 41.28 |  |
Options | Range of Exercise Price Four | Vested |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |
Exercisable at the end of the period (in shares) | 164,050 |  | 403,012 |  | 466,800 |  |
Exercise price range, options outstanding, low end of range (in dollars per share) | $ 42.75 |  | $ 41.29 |  | $ 41.29 |  |
Exercise price range, options outstanding, high end of range (in dollars per share) | $ 56.00 |  | $ 57.00 |  | $ 57.00 |  |
Performance share units |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Estimated pre-vesting forfeitures (as a percent) | 0.00% |  | 0.00% |  | 0.00% |  |
Unrecognized compensation cost | 2,100,000 |  |  |  |  |  |
Expected weighted average period during which unrecognized compensation cost will be recognized | 2 years |  |  |  |  |  |
Restricted shares |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Unrecognized compensation cost | $ 6,100,000 |  |  |  |  |  |
Expected weighted average period during which unrecognized compensation cost will be recognized | 2 years |  |  |  |  |  |
Minimum | Options |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |
Exercise price range, options forfeited (in dollars per share) | $ 18.08 |  | $ 25.52 |  | $ 22.49 |  |
Exercise price range, options exercised (in dollars per share) | $ 13.60 |  | $ 13.40 |  | $ 9.54 |  |
Minimum | Restricted shares |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Estimated pre-vesting forfeitures (as a percent) | 0.00% |  | 0.00% |  | 0.00% |  |
Maximum | Options |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |
Exercise price range, options forfeited (in dollars per share) | $ 51.62 |  | $ 57.00 |  | $ 50.59 |  |
Exercise price range, options exercised (in dollars per share) | $ 26.24 |  | $ 22.49 |  | $ 30.25 |  |
Maximum | Restricted shares |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Estimated pre-vesting forfeitures (as a percent) | 5.00% |  | 5.00% |  | 4.00% |  |
[1] | 171,288 of these options had an exercise price ranging from $19.63 to $30.04; 145,187 had an exercise price ranging from$30.05 to $41.28; 160,402 had an exercise price ranging from $41.29 to $42.74; and 164,050 had an exercise price ranging from $42.75 to $56.00.
[2] | 9,500 of these options had an exercise price ranging from $13.60 to $16.73; 204,736 had an exercise price ranging from $16.74 to $30.04; 180,962 had an exercise price ranging from $30.05 to $41.28; and 403,012 had an exercise price ranging from $41.29 to $57.00.
[3] | 53,957 of these options had an exercise price ranging from $13.40 to $16.73; 225,903 had an exercise price ranging from $16.74 to $30.04; 198,762 had an exercise price ranging from $30.05 to $41.28; and 466,800 had an exercise price ranging from $41.29 to $57.00.

X
- Definition Represents the estimated pre-vesting percentage of forfeitures considered for reduction in stock compensation expense recognized during the period. + References No definition available. + Details
Name: | ofc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEstimatedPercentageOfForfeitures
Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ofc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionAggregateIntrinsicValueAbstract
Namespace Prefix: | ofc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ofc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract
Namespace Prefix: | ofc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ofc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionWeightedAverageExercisePriceAbstract
Namespace Prefix: | ofc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The exercise price for purposes of disclosing shares exercised under stock option awards on all stock option plans. + References No definition available. + Details
Name: | ofc_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceOfExercisedOptions
Namespace Prefix: | ofc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The exercise price for purposes of disclosing shares forfeited under stock option awards on all stock option plans. + References No definition available. + Details
Name: | ofc_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceOfForfeitedOptions
Namespace Prefix: | ofc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 + Details
Name: | us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average price of options that were either forfeited or expired. + 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)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration