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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 | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  | $ 6,904 | $ 21,494 | $ 19,195 | $ 18,850 | $ 19,718 | $ (4,829) | $ (48,316) | $ 8,096 | $ 66,443 |  | $ (25,331) |  | $ 120,675 |
Gain on sales of real estate |  |  |  |  |  |  |  |  |  | 9,890 |  | 40,986 |  | 68,047 |
Preferred share/ unit dividends/ distributions |  | 0 | 0 | (3,039) | (3,180) | (3,640) | (3,552) | (3,553) | (3,552) | (6,219) |  | (14,297) |  | (14,210) |
Issuance costs associated with redeemed preferred shares |  | $ 0 | $ 0 | $ (6,847) | $ 0 | $ (17) | $ 0 | $ 0 | $ 0 | (6,847) |  | (17) |  | 0 |
Income from continuing operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | (6,242) |  | (4,216) |  | (10,575) |
Income from continuing operations attributable to share-based compensation awards |  |  |  |  |  |  |  |  |  | (449) |  | (419) |  | (706) |
Numerator for basic EPS/EPU from continuing operations attributable to COPT/COPLP common shareholders/unitholders |  |  |  |  |  |  |  |  |  | 56,576 |  | (3,294) |  | 163,231 |
Dilutive effect of common units in COPLP on diluted EPS from continuing operations |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 6,397 |
Numerator for diluted EPS/EPU from continuing operations attributable to COPT/COPLP common shareholders/unitholders |  |  |  |  |  |  |  |  |  | 56,576 |  | (3,294) |  | 169,628 |
Discontinued operations |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 156 |
Discontinued operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | (3) |
Numerator for basic EPS on net income (loss) attributable to COPT common shareholders |  |  |  |  |  |  |  |  |  | 56,576 |  | (3,294) |  | 163,384 |
Dilutive effect of common units in COPLP |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 6,403 |
Numerator for diluted EPS on net income (loss) attributable to COPT common shareholders |  |  |  |  |  |  |  |  |  | $ 56,576 |  | $ (3,294) |  | $ 169,787 |
Denominator (all weighted averages): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic EPS (common shares) |  |  |  |  |  |  |  |  |  | 98,969 |  | 94,502 |  | 93,914 |
Dilutive effect of forward equity sale agreements and share-based compensation awards |  |  |  |  |  |  |  |  |  | 186 |  | 0 |  | 61 |
Dilutive effect of common units |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 3,692 |
Denominator for basic and diluted EPS (common shares) |  |  |  |  |  |  |  |  |  | 99,155 |  | 94,502 |  | 97,667 |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share/unit) | [1] |  |  |  |  |  |  |  |  | $ 0.57 |  | $ (0.03) |  | $ 1.74 |
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) |  | $ 0.10 | $ 0.21 | $ 0.08 | $ 0.18 | $ 0.22 | $ 0.25 | $ (0.54) | $ 0.03 | 0.57 | [1] | (0.03) | [1] | 1.74 | [1]
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share/unit) | [1] |  |  |  |  |  |  |  |  | 0.57 |  | (0.03) |  | 1.74 |
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) |  | $ 0.10 | $ 0.21 | $ 0.08 | $ 0.18 | $ 0.22 | $ 0.25 | $ (0.54) | $ 0.03 | $ 0.57 | [1] | $ (0.03) | [1] | $ 1.74 | [1]
Corporate Office Properties, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  | $ 6,904 | $ 21,494 | $ 19,195 | $ 18,850 | $ 19,718 | $ (4,829) | $ (48,316) | $ 8,096 | $ 66,443 |  | $ (25,331) |  | $ 120,675 |
Gain on sales of real estate |  |  |  |  |  |  |  |  |  | 9,890 |  | 40,986 |  | 68,047 |
Preferred share/ unit dividends/ distributions |  | (165) | (165) | (3,204) | (3,345) | (3,805) | (3,717) | (3,718) | (3,717) | (6,879) |  | (14,957) |  | (14,870) |
Issuance costs associated with redeemed preferred shares |  | $ 0 | $ 0 | $ (6,847) | $ 0 | $ (17) | $ 0 | $ 0 | $ 0 | (6,847) |  | (17) |  | 0 |
Income from continuing operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | (3,646) |  | (3,715) |  | (3,523) |
Income from continuing operations attributable to share-based compensation awards |  |  |  |  |  |  |  |  |  | (449) |  | (419) |  | (706) |
Numerator for basic and diluted EPS/EPU from continuing operations attributable to COPT/COPLP common shareholders/unitholders |  |  |  |  |  |  |  |  |  | 58,512 |  | (3,453) |  | 169,623 |
Discontinued operations |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 156 |
Discontinued operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 3 |
Numerator for basic and diluted EPU on net income (loss) attributable to COPLP common unitholders |  |  |  |  |  |  |  |  |  | $ 58,512 |  | $ (3,453) |  | $ 169,782 |
Denominator (all weighted averages): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic EPS (common shares) |  |  |  |  |  |  |  |  |  | 102,331 |  | 98,135 |  | 97,606 |
Dilutive effect of forward equity sale agreements and share-based compensation awards |  |  |  |  |  |  |  |  |  | 186 |  | 0 |  | 61 |
Denominator for basic and diluted EPS (common shares) |  |  |  |  |  |  |  |  |  | 102,517 |  | 98,135 |  | 97,667 |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share/unit) | [2] |  |  |  |  |  |  |  |  | $ 0.57 |  | $ (0.04) |  | $ 1.74 |
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) |  | $ 0.10 | $ 0.21 | $ 0.08 | $ 0.18 | $ 0.22 | $ 0.25 | $ (0.54) | $ 0.03 | 0.57 | [2] | (0.04) | [2] | 1.74 | [2]
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share/unit) | [2] |  |  |  |  |  |  |  |  | 0.57 |  | (0.04) |  | 1.74 |
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) |  | $ 0.10 | $ 0.21 | $ 0.08 | $ 0.18 | $ 0.22 | $ 0.25 | $ (0.54) | $ 0.03 | $ 0.57 | [2] | $ (0.04) | [2] | $ 1.74 | [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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