XML 39 R31.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Intangible Assets on Real Estate Acquisitions (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2012
Intangible Assets on Real Estate Acquisitions |
Intangible assets on real estate acquisitions | Intangible assets on real estate acquisitions consisted of the following (in thousands):
|  | September 30, 2012 |  | December 31, 2011
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
In-place lease value |  | $ | 134,964 |  |  | $ | 89,808 |  |  | $ | 45,156 |  |  | $ | 151,361 |  |  | $ | 97,594 |  |  | $ | 53,767 |
Tenant relationship value |  | 46,827 |  |  | 22,192 |  |  | 24,635 |  |  | 45,940 |  |  | 23,246 |  |  | 22,694 |
Above-market cost arrangements |  | 12,416 |  |  | 3,789 |  |  | 8,627 |  |  | 12,416 |  |  | 2,857 |  |  | 9,559 |
Above-market leases |  | 8,925 |  |  | 7,278 |  |  | 1,647 |  |  | 10,118 |  |  | 8,037 |  |  | 2,081 |
Market concentration premium |  | 1,333 |  |  | 339 |  |  | 994 |  |  | 1,333 |  |  | 314 |  |  | 1,019 |
|  | $ | 204,465 |  |  | $ | 123,406 |  |  | $ | 81,059 |  |  | $ | 221,168 |  |  | $ | 132,048 |  |  | $ | 89,120 |

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

X
- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration