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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
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Numerator: |  |  |
Income from continuing operations |  | $ 8,096 | $ 10,987
Gain on sales of real estate, net |  | 0 | 3,986
Preferred share/unit dividends/distributions |  | (3,552) | (3,552)
Income from continuing operations attributable to noncontrolling interests |  | (1,270) | (1,392)
Income from continuing operations attributable to share-based compensation awards |  | (118) | (122)
Numerator for basic and diluted EPS from continuing operations attributable to COPT common shareholders |  | 3,156 | 9,907
Discontinued operations |  | 0 | (238)
Discontinued operations attributable to noncontrolling interests |  | 0 | 12
Numerator for basic and diluted EPS on net income attributable to COPT common shareholders |  | $ 3,156 | $ 9,681
Denominator (all weighted averages): |  |  |
Denominator for basic EPS (common shares) |  | 94,203 | 93,199
Dilutive effect of share-based compensation awards (shares) |  | 95 | 198
Denominator for diluted EPS (common shares) |  | 94,298 | 93,397
Basic EPS: |  |  |
Income from continuing operations (in dollars per share/unit) | [1] | $ 0.03 | $ 0.10
Discontinued operations (in dollars per share/unit) | [1] | 0.00 | 0.00
Net income attributable to COPT common shareholders (in dollars per share/unit) | [1] | 0.03 | 0.10
Diluted EPS: |  |  |
Income from continuing operations (in dollars per share/unit) | [1] | 0.03 | 0.10
Discontinued operations (in dollars per share/unit) | [1] | 0.00 | 0.00
Net income attributable to COPT common shareholders (in dollars per share/unit) | [1] | $ 0.03 | $ 0.10
Corporate Office Properties, L.P. |  |  |
Numerator: |  |  |
Income from continuing operations |  | $ 8,096 | $ 10,987
Gain on sales of real estate, net |  | 0 | 3,986
Preferred share/unit dividends/distributions |  | (3,717) | (3,717)
Income from continuing operations attributable to noncontrolling interests |  | (979) | (821)
Income from continuing operations attributable to share-based compensation awards |  | (118) | (122)
Numerator for basic and diluted EPS from continuing operations attributable to COPT common shareholders |  | 3,282 | 10,313
Discontinued operations |  | 0 | (238)
Discontinued operations attributable to noncontrolling interests |  | 0 | 3
Numerator for basic and diluted EPS on net income attributable to COPT common shareholders |  | $ 3,282 | $ 10,078
Denominator (all weighted averages): |  |  |
Denominator for basic EPS (common shares) |  | 97,880 | 96,931
Dilutive effect of share-based compensation awards (shares) |  | 95 | 198
Denominator for diluted EPS (common shares) |  | 97,975 | 97,129
Basic EPS: |  |  |
Income from continuing operations (in dollars per share/unit) | [2] | $ 0.03 | $ 0.10
Discontinued operations (in dollars per share/unit) | [2] | 0.00 | 0.00
Net income attributable to COPT common shareholders (in dollars per share/unit) | [2] | 0.03 | 0.10
Diluted EPS: |  |  |
Income from continuing operations (in dollars per share/unit) | [2] | 0.03 | 0.10
Discontinued operations (in dollars per share/unit) | [2] | 0.00 | 0.00
Net income attributable to COPT common shareholders (in dollars per share/unit) | [2] | $ 0.03 | $ 0.10
[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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- Definition Represents the net income after adjustments for gain on sales of real estate, preferred share dividends, income from continuing operations attributable to noncontrolling interests and income from continuing operations attributable to restricted shares used to calculate the basic and dilutive earnings per share. + References No definition available. + Details
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- Definition This element represents the net income from continuing operations including gain on sales of real estate, net of income taxes, after adjustments for dividends on preferred stock and income attributable to participating securities used to calculate basic and dilutive earnings per share from continuing operations. + References No definition available. + Details
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