XML 54 R33.htm IDEA: XBRL DOCUMENT
v3.20.4

Properties, Net (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Real Estate [Abstract] |
Schedule of operating properties, net | Operating properties, net consisted of the following (in thousands):
| December 31,
| 2020 |  | 2019
Land | $ | 528,269 |  |  | $ | 472,976 |
Buildings and improvements | 3,711,264 |  |  | 3,306,791 |
Less: Accumulated depreciation | (1,124,253) |  |  | (1,007,120) |
Operating properties, net | $ | 3,115,280 |  |  | $ | 2,772,647 |

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
- References No definition available. + Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration