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Earnings Per Share ("EPS") (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Numerator: |  |  |  |  |  |  |  |
(Loss) income from continuing operations | $ (31,816) |  | $ 1,962 |  | $ (12,160) |  | $ (21,722) |
Gain on sales of real estate, net | 0 |  | 0 |  | 21 |  | 2,728 |
Preferred share dividends | (6,546) |  | (4,025) |  | (14,738) |  | (12,076) |
Issuance costs associated with redeemed preferred shares | (1,827) |  | 0 |  | (1,827) |  | 0 |
Loss (income) from continuing operations attributable to noncontrolling interests | 1,616 |  | (581) |  | 124 |  | 540 |
Income from continuing operations attributable to restricted shares | (111) |  | (262) |  | (357) |  | (781) |
Numerator for basic EPS from continuing operations attributable to COPT common shareholders | (38,684) |  | (2,906) |  | (28,937) |  | (31,311) |
Dilutive effect of common units in the Operating Partnership on diluted EPS from continuing operations | 0 |  | 0 |  | 0 |  | (2,025) |
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders | (38,684) |  | (2,906) |  | (28,937) |  | (33,336) |
Numerator for basic EPS from continuing operations attributable to COPT common shareholders | (38,684) |  | (2,906) |  | (28,937) |  | (31,311) |
Discontinued operations | 11,051 |  | 5,508 |  | 10,212 |  | (18,109) |
Discontinued operations attributable to noncontrolling interests | (623) |  | (323) |  | (538) |  | 1,115 |
Numerator for basic EPS on net (loss) income attributable to COPT common shareholders | (28,256) |  | 2,279 |  | (19,263) |  | (48,305) |
Dilutive effect of common units in the Operating Partnership | 0 |  | 0 |  | 0 |  | (3,188) |
Numerator for diluted EPS on net (loss) income attributable to COPT common shareholders | $ (28,256) |  | $ 2,279 |  | $ (19,263) |  | $ (51,493) |
Denominator (all weighted averages): |  |  |  |  |  |  |  |
Denominator for basic EPS (common shares) | 71,688 |  | 71,312 |  | 71,590 |  | 68,718 |
Dilutive effect of common units | 0 |  | 0 |  | 0 |  | 4,371 |
Denominator for basic and diluted EPS | 71,688 |  | 71,312 |  | 71,590 |  | 73,089 |
Basic EPS: |  |  |  |  |  |  |  |
Loss from continuing operations attributable to COPT common shareholders (in dollars per share) | $ (0.54) | [1] | $ (0.04) | [1] | $ (0.40) | [1] | $ (0.46) | [1]
Discontinued operations attributable to COPT common shareholders (in dollars per share) | $ 0.15 |  | $ 0.07 |  | $ 0.13 |  | $ (0.24) |
Net (loss) income attributable to COPT common shareholders (in dollars per share) | $ (0.39) | [1] | $ 0.03 | [1] | $ (0.27) | [1] | $ (0.70) | [1]
Diluted EPS: |  |  |  |  |  |  |  |
Loss from continuing operations attributable to COPT common shareholders (in dollars per share) | $ (0.54) | [1] | $ (0.04) | [1] | $ (0.40) | [1] | $ (0.46) | [1]
Discontinued operations attributable to COPT common shareholders (in dollars per share) | $ 0.15 |  | $ 0.07 |  | $ 0.13 |  | $ (0.24) |
Net (loss) income attributable to COPT common shareholders (in dollars per share) | $ (0.39) | [1] | $ 0.03 | [1] | $ (0.27) | [1] | $ (0.70) | [1]
[1] | Basic and diluted earnings per common share are calculated based on amounts attributable to common shareholders of Corporate Office Properties Trust.

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