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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Numerator: |  |  |  |  |  |  |  |
(Loss) income from continuing operations |  | $ (48,316) |  | $ 16,839 | $ (40,220) |  | $ 27,826 |
Gain on sales of real estate, net |  | 0 |  | (1) | 0 |  | 3,985 |
Preferred share/unit dividends/distributions |  | (3,553) |  | (3,553) | (7,105) |  | (7,105) |
Income from continuing operations attributable to noncontrolling interests |  | 897 |  | (1,436) | (373) |  | (2,828) |
Income from continuing operations attributable to share-based compensation awards |  | (96) |  | (113) | (214) |  | (235) |
Numerator for basic and diluted EPS from continuing operations attributable to COPT common shareholders |  | (51,068) |  | 11,736 | (47,912) |  | 21,643 |
Discontinued operations |  | 0 |  | 394 | 0 |  | 156 |
Discontinued operations attributable to noncontrolling interests |  | 0 |  | (15) | 0 |  | (3) |
Numerator for basic and diluted EPS on net income attributable to COPT common shareholders |  | $ (51,068) |  | $ 12,115 | $ (47,912) |  | $ 21,796 |
Denominator (all weighted averages): |  |  |  |  |  |  |  |
Denominator for basic EPS (common shares) |  | 94,300 |  | 94,128 | 94,251 |  | 93,666 |
Dilutive effect of share-based compensation awards (shares) |  | 0 |  | 35 | 0 |  | 114 |
Denominator for diluted EPS (common shares) |  | 94,300 |  | 94,163 | 94,251 |  | 93,780 |
Basic EPS: |  |  |  |  |  |  |  |
(Loss) income from continuing operations (in dollars per share/unit) |  | $ (0.54) | [1] | $ 0.13 | $ (0.51) | [1] | $ 0.23 | [1]
Discontinued operations (in dollars per share/unit) | [1] | 0.00 |  | 0.00 | 0.00 |  | 0.00 |
Net (loss) income attributable to COPT common shareholders (in dollars per share/unit) | [1] | (0.54) |  | 0.13 | (0.51) |  | 0.23 |
Diluted EPS: |  |  |  |  |  |  |  |
(Loss) income from continuing operations (in dollars per share/unit) |  | (0.54) | [1] | 0.13 | (0.51) | [1] | 0.23 | [1]
Discontinued operations (in dollars per share/unit) | [1] | 0.00 |  | 0.00 | 0.00 |  | 0.00 |
Net (loss) income attributable to COPT common shareholders (in dollars per share/unit) | [1] | $ (0.54) |  | $ 0.13 | $ (0.51) |  | $ 0.23 |
Corporate Office Properties, L.P. |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
(Loss) income from continuing operations |  | $ (48,316) |  | $ 16,839 | $ (40,220) |  | $ 27,826 |
Gain on sales of real estate, net |  | 0 |  | (1) | 0 |  | 3,985 |
Preferred share/unit dividends/distributions |  | (3,718) |  | (3,718) | (7,435) |  | (7,435) |
Income from continuing operations attributable to noncontrolling interests |  | (911) |  | (812) | (1,890) |  | (1,633) |
Income from continuing operations attributable to share-based compensation awards |  | (96) |  | (113) | (214) |  | (235) |
Numerator for basic and diluted EPS from continuing operations attributable to COPT common shareholders |  | (53,041) |  | 12,195 | (49,759) |  | 22,508 |
Discontinued operations |  | 0 |  | 394 | 0 |  | 156 |
Discontinued operations attributable to noncontrolling interests |  | 0 |  | 0 | 0 |  | 3 |
Numerator for basic and diluted EPS on net income attributable to COPT common shareholders |  | $ (53,041) |  | $ 12,589 | $ (49,759) |  | $ 22,667 |
Denominator (all weighted averages): |  |  |  |  |  |  |  |
Denominator for basic EPS (common shares) |  | 97,976 |  | 97,808 | 97,927 |  | 97,372 |
Dilutive effect of share-based compensation awards (shares) |  | 0 |  | 35 | 0 |  | 114 |
Denominator for diluted EPS (common shares) |  | 97,976 |  | 97,843 | 97,927 |  | 97,486 |
Basic EPS: |  |  |  |  |  |  |  |
(Loss) income from continuing operations (in dollars per share/unit) | [2] | $ (0.54) |  | $ 0.13 | $ (0.51) |  | $ 0.23 |
Discontinued operations (in dollars per share/unit) | [2] | 0.00 |  | 0.00 | 0.00 |  | 0.00 |
Net (loss) income attributable to COPT common shareholders (in dollars per share/unit) | [2] | (0.54) |  | 0.13 | (0.51) |  | 0.23 |
Diluted EPS: |  |  |  |  |  |  |  |
(Loss) income from continuing operations (in dollars per share/unit) | [2] | (0.54) |  | 0.13 | (0.51) |  | 0.23 |
Discontinued operations (in dollars per share/unit) | [2] | 0.00 |  | 0.00 | 0.00 |  | 0.00 |
Net (loss) income attributable to COPT common shareholders (in dollars per share/unit) | [2] | $ (0.54) |  | $ 0.13 | $ (0.51) |  | $ 0.23 |
[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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