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Earnings Per Share ("EPS") and Earnings Per Unit ("EPU") (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Numerator: |  |  |  |  |  |  |  |
(Loss) income from continuing operations |  | $ (4,829) |  | $ 94,279 | $ (45,049) |  | $ 122,105 |
Gain on sales of real estate, net |  | 34,101 |  | 15 | 34,101 |  | 4,000 |
Preferred share/unit dividends/distributions |  | (3,552) |  | (3,552) | (10,657) |  | (10,657) |
Income from continuing operations attributable to noncontrolling interests |  | (1,973) |  | (4,494) | (2,346) |  | (7,322) |
Income from continuing operations attributable to share-based compensation awards |  | (105) |  | (369) | (319) |  | (475) |
Numerator for basic EPS from continuing operations attributable to COPT common shareholders |  | 23,642 |  | 85,879 | (24,270) |  | 107,651 |
Convertible preferred shares/units |  | 0 |  | 372 | 0 |  | 0 |
Dilutive effect of common units in COPLP on diluted EPS from continuing operations |  | 0 |  | 0 | 0 |  | 4,225 |
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders |  | 23,642 |  | 86,251 | (24,270) |  | 111,876 |
Numerator for basic EPS from continuing operations attributable to COPT common shareholders |  | 23,642 |  | 85,879 | (24,270) |  | 107,651 |
Discontinued operations |  | 0 |  | 0 | 0 |  | 156 |
Discontinued operations attributable to noncontrolling interests |  | 0 |  | 0 | 0 |  | (3) |
Numerator for basic EPS on net income attributable to COPT common shareholders |  | 23,642 |  | 85,879 | (24,270) |  | 107,804 |
Convertible preferred shares/units |  | 0 |  | 372 | 0 |  | 0 |
Dilutive effect of common units in COPLP |  | 0 |  |  | 0 |  | 4,231 |
Numerator for diluted EPS on net income attributable to COPT common shareholders |  | $ 23,642 |  | $ 86,251 | $ (24,270) |  | $ 112,035 |
Denominator (all weighted averages): |  |  |  |  |  |  |  |
Denominator for basic EPS (common shares) |  | 94,433 |  | 94,153 | 94,312 |  | 93,830 |
Convertible preferred shares (shares) |  | 0 |  | 434 | 0 |  | 0 |
Dilutive effect of common units (shares) |  | 0 |  |  | 0 |  | 3,697 |
Dilutive effect of share-based compensation awards (shares) |  | 81 |  | 21 | 0 |  | 82 |
Denominator for diluted EPS (common shares) |  | 94,514 |  | 94,608 | 94,312 |  | 97,609 |
Basic EPS: |  |  |  |  |  |  |  |
(Loss) income from continuing operations (in dollars per share/unit) |  | $ 0.25 | [1] | $ 0.91 | $ (0.26) | [1] | $ 1.15 | [1]
Discontinued operations (in dollars per share/unit) | [1] | 0.00 |  | 0.00 | 0.00 |  | 0.00 |
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) | [1] | 0.25 |  | 0.91 | (0.26) |  | 1.15 |
Diluted EPS: |  |  |  |  |  |  |  |
(Loss) income from continuing operations (in dollars per share/unit) |  | 0.25 | [1] | 0.91 | (0.26) | [1] | 1.15 | [1]
Discontinued operations (in dollars per share/unit) | [1] | 0.00 |  | 0.00 | 0.00 |  | 0.00 |
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) | [1] | $ 0.25 |  | $ 0.91 | $ (0.26) |  | $ 1.15 |
Corporate Office Properties, L.P. |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
(Loss) income from continuing operations |  | $ (4,829) |  | $ 94,279 | $ (45,049) |  | $ 122,105 |
Gain on sales of real estate, net |  | 34,101 |  | 15 | 34,101 |  | 4,000 |
Preferred share/unit dividends/distributions |  | (3,717) |  | (3,717) | (11,152) |  | (11,152) |
Income from continuing operations attributable to noncontrolling interests |  | (913) |  | (972) | (2,803) |  | (2,605) |
Income from continuing operations attributable to share-based compensation awards |  | (105) |  | (369) | (319) |  | (475) |
Numerator for basic EPS from continuing operations attributable to COPT common shareholders |  | 24,537 |  | 89,236 | (25,222) |  | 111,873 |
Convertible preferred shares/units |  | 0 |  | 372 | 0 |  | 0 |
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders |  | 24,537 |  | 89,608 | (25,222) |  | 111,873 |
Numerator for basic EPS from continuing operations attributable to COPT common shareholders |  | 24,537 |  | 89,236 | (25,222) |  | 111,873 |
Discontinued operations |  | 0 |  | 0 | 0 |  | 156 |
Discontinued operations attributable to noncontrolling interests |  | 0 |  | 0 | 0 |  | 3 |
Numerator for basic EPS on net income attributable to COPT common shareholders |  | 24,537 |  | 89,236 | (25,222) |  | 112,032 |
Convertible preferred shares/units |  | 0 |  | 372 | 0 |  | 0 |
Numerator for diluted EPS on net income attributable to COPT common shareholders |  | $ 24,537 |  | $ 89,608 | $ (25,222) |  | $ 112,032 |
Denominator (all weighted averages): |  |  |  |  |  |  |  |
Denominator for basic EPS (common shares) |  | 98,024 |  | 97,832 | 97,960 |  | 97,527 |
Convertible preferred shares (shares) |  | 0 |  | 434 | 0 |  | 0 |
Dilutive effect of share-based compensation awards (shares) |  | 81 |  | 21 | 0 |  | 82 |
Denominator for diluted EPS (common shares) |  | 98,105 |  | 98,287 | 97,960 |  | 97,609 |
Basic EPS: |  |  |  |  |  |  |  |
(Loss) income from continuing operations (in dollars per share/unit) | [2] | $ 0.25 |  | $ 0.91 | $ (0.26) |  | $ 1.15 |
Discontinued operations (in dollars per share/unit) | [2] | 0.00 |  | 0.00 | 0.00 |  | 0.00 |
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) | [2] | 0.25 |  | 0.91 | (0.26) |  | 1.15 |
Diluted EPS: |  |  |  |  |  |  |  |
(Loss) income from continuing operations (in dollars per share/unit) | [2] | 0.25 |  | 0.91 | (0.26) |  | 1.15 |
Discontinued operations (in dollars per share/unit) | [2] | 0.00 |  | 0.00 | 0.00 |  | 0.00 |
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) | [2] | $ 0.25 |  | $ 0.91 | $ (0.26) |  | $ 1.15 |
[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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