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Earnings Per Share ("EPS") and Earnings Per Unit ("EPU") (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Numerator: |  |  |  |  |  |  |  |
Income (loss) from continuing operations | $ 9,248 |  | $ (232) |  | $ 14,908 |  | $ 11,430 |
Gain on sales of real estate, net | 0 |  | 329 |  | 0 |  | 2,683 |
Preferred share/unit dividends/distributions | (4,344) |  | (4,885) |  | (8,834) |  | (10,991) |
Issuance costs associated with redeemed preferred shares | (1,769) |  | (2,904) |  | (1,769) |  | (2,904) |
Income from continuing operations attributable to noncontrolling interests | (1,171) |  | (1,087) |  | (2,103) |  | (1,254) |
Income from continuing operations attributable to restricted shares | (108) |  | (102) |  | (229) |  | (220) |
Numerator for basic EPS from continuing operations attributable to COPT common shareholders | 1,856 |  | (8,881) |  | 1,973 |  | (1,256) |
Dilutive effect of common units in COPLP on diluted EPS from continuing operations | 0 |  | (478) |  | 0 |  | (108) |
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders | 1,856 |  | (9,359) |  | 1,973 |  | (1,364) |
Discontinued operations | (198) |  | (4,502) |  | (187) |  | (3,241) |
Discontinued operations attributable to noncontrolling interests | 11 |  | 127 |  | 13 |  | 37 |
Numerator for basic EPS on net (loss) income attributable to COPT common shareholders | 1,669 |  | (13,256) |  | 1,799 |  | (4,460) |
Dilutive effect of common units in COPLP | 0 |  | (671) |  | 0 |  | (242) |
Numerator for diluted EPS on net income (loss) attributable to COPT common shareholders | 1,669 |  | (13,927) |  | 1,799 |  | (4,702) |
Denominator (all weighted averages): |  |  |  |  |  |  |  |
Denominator for basic EPS (common shares) | 87,214 |  | 85,425 |  | 87,148 |  | 83,422 |
Dilutive effects of common units | 0 |  | 3,801 |  | 0 |  | 3,847 |
Dilutive effect of share-based compensation awards | 201 |  | 0 |  | 156 |  | 0 |
Denominator for diluted EPS (common shares) | 87,415 |  | 89,226 |  | 87,304 |  | 87,269 |
Basic EPS: |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share/unit) | $ 0.02 | [1] | $ (0.10) | [1] | $ 0.02 | [1] | $ (0.02) | [1]
Discontinued operations (in dollars per share/unit) | $ 0.00 | [1] | $ (0.06) | [1] | $ 0.00 | [1] | $ (0.03) | [1]
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) | $ 0.02 | [1] | $ (0.16) | [1] | $ 0.02 | [1] | $ (0.05) | [1]
Diluted EPS: |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share/unit) | $ 0.02 | [1] | $ (0.10) | [1] | $ 0.02 | [1] | $ (0.02) | [1]
Discontinued operations (in dollars per share/unit) | $ 0.00 | [1] | $ (0.06) | [1] | $ 0.00 | [1] | $ (0.03) | [1]
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) | $ 0.02 | [1] | $ (0.16) | [1] | $ 0.02 | [1] | $ (0.05) | [1]
Corporate Office Properties, L.P. |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Income (loss) from continuing operations | 9,248 |  | (232) |  | 14,908 |  | 11,430 |
Gain on sales of real estate, net | 0 |  | 329 |  | 0 |  | 2,683 |
Preferred share/unit dividends/distributions | (4,509) |  | (5,050) |  | (9,164) |  | (11,321) |
Issuance costs associated with redeemed preferred shares | (1,769) |  | (2,904) |  | (1,769) |  | (2,904) |
Income from continuing operations attributable to noncontrolling interests | (840) |  | (1,408) |  | (1,579) |  | (1,039) |
Income from continuing operations attributable to restricted shares | (108) |  | (102) |  | (229) |  | (220) |
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders | 2,022 |  | (9,367) |  | 2,167 |  | (1,371) |
Discontinued operations | (198) |  | (4,502) |  | (187) |  | (3,241) |
Discontinued operations attributable to noncontrolling interests | 3 |  | (65) |  | 5 |  | (98) |
Numerator for diluted EPS on net income (loss) attributable to COPT common shareholders | $ 1,827 |  | $ (13,934) |  | $ 1,985 |  | $ (4,710) |
Denominator (all weighted averages): |  |  |  |  |  |  |  |
Denominator for basic EPS (common shares) | 91,126 |  | 89,226 |  | 91,082 |  | 87,269 |
Dilutive effect of share-based compensation awards | 201 |  | 0 |  | 156 |  | 0 |
Denominator for diluted EPS (common shares) | 91,327 |  | 89,226 |  | 91,238 |  | 87,269 |
Basic EPS: |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share/unit) | $ 0.02 | [2] | $ (0.10) | [2] | $ 0.02 | [2] | $ (0.02) | [2]
Discontinued operations (in dollars per share/unit) | $ 0.00 | [2] | $ (0.06) | [2] | $ 0.00 | [2] | $ (0.03) | [2]
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) | $ 0.02 | [2] | $ (0.16) | [2] | $ 0.02 | [2] | $ (0.05) | [2]
Diluted EPS: |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share/unit) | $ 0.02 | [2] | $ (0.10) | [2] | $ 0.02 | [2] | $ (0.02) | [2]
Discontinued operations (in dollars per share/unit) | $ 0.00 | [2] | $ (0.06) | [2] | $ 0.00 | [2] | $ (0.03) | [2]
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) | $ 0.02 | [2] | $ (0.16) | [2] | $ 0.02 | [2] | $ (0.05) | [2]
[1] | Basic and diluted earnings per common share are calculated based on amounts attributable to common shareholders of Corporate Office Properties Trust.
[2] | Basic and diluted earnings per common unit are calculated based on amounts attributable to common unitholders of Corporate Office Properties, L.P.

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