XML 66 R35.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Properties, net (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2011
Properties, net |
Schedule of components of net operating properties |
|  | December 31, |
--- | --- | --- | ---
|  | 2011 |  | 2010 |
Land |  | $ | 472,483 |  | $ | 501,210 |
Buildings and improvements |  |  | 2,801,252 |  |  | 2,804,595 |
Less: accumulated depreciation |  |  | (559,679 | ) |  | (503,032 | )
Operating properties, net |  | $ | 2,714,056 |  | $ | 2,802,773
Schedule of projects in development or held for future development |
|  | December 31, |
--- | --- | --- | ---
|  | 2011 |  | 2010 |
Land |  | $ | 229,833 |  | $ | 256,487 |
Construction in progress, excluding land |  |  | 409,086 |  |  | 386,195 |
Projects in development or held for future development |  | $ | 638,919 |  | $ | 642,682
Schedule of operating property dispositions |
Project Name |  | Location |  | Date of Sale |  | Number of Buildings |  | Total Rentable Square Feet |  | Sale Price |  | Gain on Sale |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
1344 & 1348 Ashton Road and 1350 Dorsey Road |  | Hanover, Maryland |  | 5/24/2011 |  |  | 3 |  |  | 39,000 |  | $ | 3,800 |  | $ | 150 |
216 Schilling Circle |  | Hunt Valley, Maryland |  | 8/23/2011 |  |  | 1 |  |  | 36,000 |  |  | 4,700 |  |  | 175 |
Towson Portfolio |  | Towson, Maryland |  | 9/29/2011 |  |  | 4 |  |  | 179,000 |  |  | 16,000 |  |  | 1,134 |
11011 McCormick Road |  | Hunt Valley, Maryland |  | 11/1/2011 |  |  | 1 |  |  | 57,000 |  |  | 3,450 |  |  | 822 |
10001 Franklin Square Drive |  | White Marsh, Maryland |  | 12/13/2011 |  |  | 1 |  |  | 218,000 |  |  | 16,250 |  |  | 305 |
Rutherford Business Center Portfolio |  | Woodlawn, Maryland |  | 12/15/2011 |  |  | 13 |  |  | 365,000 |  |  | 32,460 |  |  | 2,221 |
|  |  |  |  |  |  | 23 |  |  | 894,000 |  | $ | 76,660 |  | $ | 4,807
Schedule of impairment losses recognized in 2011 by period of recognition and by property classification |
|  | Three Months Ended |
--- | --- | --- | ---
|  | 3/31/2011 |  | 6/30/2011 |  | 12/31/2011 |  | Total |
Non-operating properties |  | $ | 27,742 |  | $ | 13,574 |  | $ | 39,193 |  | $ | 80,509 |
Operating properties |  |  | — |  |  | 31,031 |  |  | 39,481 |  |  | 70,512 |
Total |  | $ | 27,742 |  | $ | 44,605 |  | $ | 78,674 |  | $ | 151,021
2011 Acquisition |
Acquisitions |
Schedule of allocation of acquisition costs of property |
Land, operating properties |  | $ | 261 |
Building and improvements |  |  | 26,577 |
Intangible assets on real estate acquisitions |  |  | 6,575 |
Total assets |  | $ | 33,413
Schedule of allocation of intangible assets on acquisition of property |
|  |  |  | Weighted Average Amortization Period (in Years) |
--- | --- | --- | --- | --- | ---
Tenant relationship value |  | $ | 3,187 |  |  | 8 |
In-place lease value |  |  | 2,904 |  |  | 3 |
Above-market leases |  |  | 484 |  |  | 3 |
|  | $ | 6,575 |  |  | 6
2010 Acquisitions |
Acquisitions |
Schedule of allocation of acquisition costs of property |
Land, operating properties |  | $ | 13,265 |
Land, development |  |  | 5,545 |
Building and improvements |  |  | 173,589 |
Construction in progress |  |  | 85,525 |
Intangible assets on real estate acquisitions |  |  | 42,896 |
Total assets |  |  | 320,820 |
Below-market leases |  |  | (231 | )
Total acquisition cost |  | $ | 320,589
Schedule of allocation of intangible assets on acquisition of property |
|  |  |  | Weighted Average Amortization Period (in Years) |
--- | --- | --- | --- | --- | ---
In-place lease value |  | $ | 21,616 |  |  | 4 |
Tenant relationship value |  |  | 14,450 |  |  | 10 |
Above-market cost arrangements |  |  | 6,193 |  |  | 40 |
Above-market leases |  |  | 637 |  |  | 2 |
|  | $ | 42,896 |  |  | 11

X
- Definition Tabular disclosure of net operating properties that includes carrying amount of properties and accumulated depreciation. + References No definition available. + Details
Name: | ofc_ScheduleOfOperatingPropertiesTableTextBlock
Namespace Prefix: | ofc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information pertaining to operating property dispositions during the period, by disposition. + References No definition available. + Details
Name: | ofc_ScheduleOfOperatingPropertyDispositionsTableTextBlock
Namespace Prefix: | ofc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of properties in development or held for future development, which includes amount of land and costs incurred for construction and development. + References No definition available. + Details
Name: | ofc_ScheduleOfProjectsInDevelopmentOrHeldForFutureDevelopmentTableTextBlock
Namespace Prefix: | ofc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure for impairment of long-lived assets held and used by an entity which includes a description of the impaired long-lived asset and facts and circumstances leading to the impairment, aggregate amount of the impairment loss and where the loss is located in the income statement, method(s) for determining fair value, and the segment in which the impaired long-lived asset is reported. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 26 -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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section CC -Subsection 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
Name: | us-gaap_DetailsOfImpairmentOfLongLivedAssetsHeldAndUsedByAssetTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of finite-lived intangible assets acquired as part of a business combination, by major class (assets that can be grouped together because they are similar, either by their nature or by their use in operations of the entity) and in total, including the value of the asset acquired, any significant residual value (the expected value of the asset at the end of its useful life) and the weighted-average amortization period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44 -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 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275 + Details
Name: | us-gaap_ScheduleOfFiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of all of the fair values of the purchase price and assets and liabilities acquired in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 805 -SubTopic 30 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e6927-128479 + Details
Name: | us-gaap_ScheduleOfPurchasePriceAllocationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration