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Equity - COPLP and Subsidiaries (Details) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended
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Mar. 19, 2013 | Oct. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jul. 16, 2013 Common Stock Issued to Public Under At-the-Market Program | Jun. 27, 2012 Series L Preferred Units Public Offering | Aug. 06, 2012 Series G Preferred Shares | Dec. 31, 2013 Preferred Shares | Dec. 31, 2012 Preferred Shares | Dec. 31, 2013 Series H | Dec. 31, 2013 Series K | Dec. 31, 2013 Series L Cumulative Preferred Stock | Jun. 27, 2012 Series L Cumulative Preferred Stock Public Offering | Apr. 22, 2013 Series J | Dec. 31, 2013 Common Shares | Dec. 31, 2012 Common Shares | Dec. 31, 2011 Common Shares | Dec. 31, 2013 Corporate Office Properties, L.P. | Dec. 31, 2012 Corporate Office Properties, L.P. | Dec. 31, 2011 Corporate Office Properties, L.P. | Jul. 16, 2013 Corporate Office Properties, L.P. Common Stock Issued to Public Under At-the-Market Program | Dec. 31, 2013 Corporate Office Properties, L.P. Common Units Trustee | Dec. 31, 2012 Corporate Office Properties, L.P. Common Units | Dec. 31, 2013 Corporate Office Properties, L.P. Conversion of Series I preferred units | Jun. 27, 2012 Corporate Office Properties, L.P. Series L Preferred Units Public Offering | Aug. 06, 2012 Corporate Office Properties, L.P. Series G Preferred Shares | Dec. 31, 2012 Corporate Office Properties, L.P. Preferred Shares | Dec. 31, 2013 Corporate Office Properties, L.P. Series H | Dec. 31, 2013 Corporate Office Properties, L.P. Series K | Dec. 31, 2013 Corporate Office Properties, L.P. Series L Cumulative Preferred Stock | Jun. 27, 2012 Corporate Office Properties, L.P. Series L Cumulative Preferred Stock Public Offering | Apr. 22, 2013 Corporate Office Properties, L.P. Series J | Mar. 31, 2013 Corporate Office Properties, L.P. Common Shares | Oct. 31, 2012 Corporate Office Properties, L.P. Common Shares | Dec. 31, 2012 Corporate Office Properties, L.P. Common Shares
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  | 9,431,667 |  |  |  |  |  |  |  | 2,000,000 | 531,667 | 6,900,000 |  |  |  |  |  | 9,431,667 |  |  |  |  |  |  |  |  |  | 2,000,000 | 531,667 | 6,900,000 |  |  |  |  |
Aggregate Liquidation Preference |  |  | $ 249,083,000 | $ 333,833,000 |  |  |  |  |  |  | $ 50,000,000 | $ 26,583,000 | $ 172,500,000 |  |  |  |  |  | $ 249,083,000 |  |  |  |  |  |  |  |  |  | $ 50,000,000 | $ 26,583,000 | $ 172,500,000 |  |  |  |  |
Annual dividend yield |  |  |  |  |  |  |  | 8.00% |  |  | 7.50% | 5.60% | 7.375% |  | 7.625% |  |  |  |  |  |  |  |  |  | 7.50% |  | 8.00% |  | 7.50% | 5.60% | 7.375% |  | 7.625% |  |  |
Annual dividend per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 1.87500 | $ 2.80000 | $ 1.84375 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.87500 | $ 2.80000 | $ 1.84375 |  |  |  |  |
Number of common shares to be issued on conversion of each preferred share |  |  |  |  |  |  |  |  |  |  |  | 0.8163 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.8163 |  |  |  |  |  |
Net proceeds from issuance of Series L preferred shares |  |  | 0 | 165,652,000 | 0 |  |  |  |  |  |  |  |  | 165,700,000 |  |  |  |  | 0 | 165,652,000 | 0 |  |  |  |  |  |  |  |  |  |  | 165,700,000 |  |  |  |
Number of Series L preferred units of operating partnerships received in exchange for offering proceeds (in units) |  |  |  |  |  |  | 6,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,900,000 |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price per share |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  | $ 25 |  |  |
Stock redeemed or called during period (in units/ shares) |  |  | 84,750,000 | 55,000,000 |  |  |  | 55,000,000 |  |  |  |  |  |  | 84,800,000 |  |  |  | 84,750,000 | 55,000,000 |  |  |  |  |  |  | 55,000,000 |  |  |  |  |  | 84,800,000 |  |  |
Issuance costs associated with redeemed preferred shares |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |  | 2,900,000 |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  | 2,900,000 |  |  |
Annual Cumulative Preferred Return Increment Frequency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to the public | 4,485,000 | 8,600,000 |  |  | 4,600,000 | 1,500,000 |  |  |  | 6,900,000 |  |  |  | 6,900,000 |  | 4,485,000 | 8,625,000 | 4,600,000 |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  | 6,900,000 |  | 4,485,000.000 | 8,600,000.0 |
Per share value of common and preferred shares issued to the public (in dollars per share) | $ 26.34 | $ 24.75 |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  | $ 26.34 | $ 24.75 |
Net proceeds from issue of shares after underwriter discounts but before offering expenses | 118,100,000 | 204,900,000 | 117,961,000 |  | 145,367,000 | 38,500,000 |  |  |  | 165,652,000 |  |  |  |  |  |  | 204,696,000 |  | 117,961,000 |  | 145,367,000 | 38,500,000 |  |  |  |  |  | 165,652,000 |  |  |  |  |  | 118,100,000 | 204,900,000 | 204,696,000
Issuance of stock, weighted average price per share |  |  |  |  |  | $ 26.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of stock issuance costs |  |  |  |  |  | 586,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 586,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares for each converted common unit (in shares) |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating partnerships units converted into common shares (in units) |  |  | 311,343 | 234,246 | 100,939 |  |  |  |  |  |  |  |  |  |  |  |  |  | 311,343.000 | 234,246.000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share |  |  | $ 1.1000 | $ 1.1 | $ 1.65 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.1 | $ 1.1 | $ 1.65 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited Partners' Capital Account, Units Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  |  |  |  |  |  |  |  |  |  |
Preferred units in COPLP |  |  | $ 8,800,000 | $ 8,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,800,000 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |
Common Units Conversion Basis Units Issuable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.5 |  |  |  |  |  |  |  |  |  |  |
Percentage ownership in operating partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.60% | 95.20% |  |  |  |  |  |  |  |  |  |  |  |
Number of trustees controlling additional common units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Additional percentage of common units controlled by trustees (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.40% |  |  |  |  |  |  |  |  |  |  |  |  |

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