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Information by Business Segment (Details 3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Reconciliation of segment assets to total assets |  |  |
Assets | $ 3,670,257 us-gaap_Assets | $ 3,629,952 us-gaap_Assets |
Segment assets |  |  |
Reconciliation of segment assets to total assets |  |  |
Assets | 2,951,495 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 2,905,630 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 2,945,930 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember
Non-operating property assets |  |  |
Reconciliation of segment assets to total assets |  |  |
Assets | 567,586 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ofc_NonOperatingPropertyAssetsMember | 517,564 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ofc_NonOperatingPropertyAssetsMember |
Other assets |  |  |
Reconciliation of segment assets to total assets |  |  |
Assets | $ 151,176 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | $ 206,758 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Details
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