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v2.4.1.9

Consolidated Statements of Equity (Parenthetical) | 1 Months Ended | 12 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2014 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 16, 2013 | Dec. 31, 2011
Balance (in units/ shares) |  |  | 93,255,284 us-gaap_CommonStockSharesOutstanding | 87,394,512 us-gaap_CommonStockSharesOutstanding | 80,952,986 us-gaap_CommonStockSharesOutstanding |  | 72,011,324 us-gaap_CommonStockSharesOutstanding
Conversion of common units to common shares (in shares/units) |  |  | 140,149 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits | 311,343 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits | 234,246 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits |  |
Shares issued to the public (in units/shares) | 5,520,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 4,485,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |
Exercise of share options (in units/shares) |  |  | 62,888 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 39,331 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 61,624 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |
Restricted common units/shares redemptions |  |  | 57,537 us-gaap_StockRepurchasedDuringPeriodShares | 78,440 us-gaap_StockRepurchasedDuringPeriodShares | 139,851 us-gaap_StockRepurchasedDuringPeriodShares |  |
Preferred Shares |  |  |  |  |  |  |
Shares issued to the public (in units/shares) |  |  |  |  | 6,900,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |
Stock redeemed or called during period (in units/ shares) |  |  | (2,000,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | (3,390,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | (2,200,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |
Common Shares |  |  |  |  |  |  |
Shares issued to the public (in units/shares) |  |  | 5,520,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,485,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 8,625,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Common Stock Issued to Public Under At-the-Market Program |  |  |  |  |  |  |
Shares issued to the public (in units/shares) |  |  |  | 1,500,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = ofc_CommonStockIssuedtoPublicUnderAttheMarketProgramMember |  | 1,500,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = ofc_CommonStockIssuedtoPublicUnderAttheMarketProgramMember |

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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