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v2.3.0.11

Properties, net (Details 3) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2011
Strategic Reallocation Plan and Impairment Losses |  |
Term of Strategic Reallocation Plan (in years) | 3 | 3
Aggregate non-cash impairment losses on properties to be disposed | $ 44,600,000 | $ 44,600,000
Non-cash impairment losses on properties to be disposed in discontinued operations | 6,315,000 | 6,315,000
Income tax benefit of aggregate non-cash impairment losses on properties to be disposed | 4,600,000 | 4,600,000
Expected net proceeds from Strategic Reallocation Plan |  | 200,000,000
Number of Strategic Reallocation Plan Properties Sold |  | 3
Square Footage of Strategic Reallocation Plan Properties Sold |  | 39,000
Sale Price of Strategic Reallocation Plan Properties Sold |  | 3,800,000
Gain on Sale of Strategic Reallocation Plan Properties Sold |  | 150,000
Number of operating properties held for sale | 17 | 17
Fort Ritchie |  |
Properties |  |
Non-cash impairment losses |  | $ 27,700,000

X
- Definition Represents the total gain recognized on properties sold during the period under the Strategic Reallocation Plan. + Details
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Namespace Prefix: | ofc
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the aggregate impairment loss recognized during the period related to properties expected to be disposed, including amounts in continuing and discontinued operations. + Details
Name: | ofc_ImpairmentOfPropertiesToBeDisposedAggregate
Namespace Prefix: | ofc
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the income tax benefit on aggregate impairment loss recognized during the period related to properties expected to be disposed, including amounts in continuing and discontinued operations. + Details
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Namespace Prefix: | ofc
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the aggregate impairment loss recognized during the period related to properties expected to be disposed that are included in discontinued operations. + Details
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Namespace Prefix: | ofc
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of operating real estate properties held for sale as of the balance sheet date. + Details
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Namespace Prefix: | ofc
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Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of properties sold during the period under the Strategic Reallocation Plan. + Details
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Namespace Prefix: | ofc
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the total sale price of properties sold during the period under the Strategic Reallocation Plan. + Details
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Namespace Prefix: | ofc
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the total square feet of properties sold during the period under the Strategic Reallocation Plan. + Details
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Namespace Prefix: | ofc
Data Type: | xbrli:decimalItemType
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- Details
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- Definition The expected amount of net sale proceeds from the disposal of properties under Strategic Reallocation Plan after the repayment of debt secured by properties. + Details
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Namespace Prefix: | ofc
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the term under the Strategic Reallocation Plan for properties under the plan to be disposed. + Details
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Namespace Prefix: | ofc
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 26 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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- 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. + Details
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