XML 103 R29.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Properties, net (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2013
Real Estate [Abstract] |
Schedule of operating properties, net | Operating properties, net consisted of the following (in thousands):
| June 30, 2013 |  | December 31, 2012
Land | $ | 431,466 |  |  | $ | 427,766 |
Buildings and improvements | 2,869,326 |  |  | 2,725,875 |
Less: accumulated depreciation | (597,783 | ) |  | (555,975 | )
Operating properties, net | $ | 2,703,009 |  |  | $ | 2,597,666 |
Schedule of projects in development or held for future development | Projects we had in development or held for future development consisted of the following (in thousands):
| June 30, 2013 |  | December 31, 2012
Land | $ | 231,357 |  |  | $ | 236,324 |
Construction in progress, excluding land | 276,938 |  |  | 329,054 |
Projects in development or held for future development | $ | 508,295 |  |  | $ | 565,378 |

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 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_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration