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Earnings Per Share ("EPS") (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Numerator: |  |  |  |  |  |  |  |
Income (loss) from continuing operations | $ 11,544 |  | $ (4,182) |  | $ 20,056 |  | $ (25,529) |
Gain on sales of real estate, net | 21 |  | 27 |  | 21 |  | 2,728 |
Preferred share dividends | (4,167) |  | (4,026) |  | (8,192) |  | (8,051) |
(Income) loss from continuing operations attributable to noncontrolling interests | (1,090) |  | 411 |  | (1,474) |  | 1,192 |
Income from continuing operations attributable to restricted shares | (105) |  | (237) |  | (246) |  | (519) |
Numerator for basic EPS from continuing operations attributable to COPT common shareholders | 6,203 |  | (8,007) |  | 10,165 |  | (30,179) |
Dilutive effect of common units in the Operating Partnership on diluted EPS from continuing operations | 0 |  | (517) |  | 0 |  | (2,002) |
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders | 6,203 |  | (8,524) |  | 10,165 |  | (32,181) |
Numerator for basic EPS from continuing operations attributable to COPT common shareholders | 6,203 |  | (8,007) |  | 10,165 |  | (30,179) |
Discontinued operations | 296 |  | (21,852) |  | (1,239) |  | (21,772) |
Discontinued operations attributable to noncontrolling interests | (17) |  | 1,372 |  | 67 |  | 1,367 |
Numerator for basic EPS on net (loss) income attributable to COPT common shareholders | 6,482 |  | (28,487) |  | 8,993 |  | (50,584) |
Dilutive effect of common units in the Operating Partnership | 0 |  | (1,887) |  | 0 |  | (3,366) |
Numerator for diluted EPS on net income (loss) attributable to COPT common shareholders | $ 6,482 |  | $ (30,374) |  | $ 8,993 |  | $ (53,950) |
Denominator (all weighted averages): |  |  |  |  |  |  |  |
Denominator for basic EPS (common shares) | 71,624 |  | 68,446 |  | 71,541 |  | 67,399 |
Dilutive effect of common units | 0 |  | 4,382 |  | 0 |  | 4,389 |
Dilutive effect of share-based compensation awards | 25 |  | 0 |  | 35 |  | 0 |
Denominator for diluted EPS | 71,649 |  | 72,828 |  | 71,576 |  | 71,788 |
Basic EPS: |  |  |  |  |  |  |  |
Loss from continuing operations attributable to COPT common shareholders (in dollars per share) | $ 0.09 | [1] | $ (0.12) | [1] | $ 0.14 | [1] | $ (0.45) | [1]
Discontinued operations attributable to COPT common shareholders (in dollars per share) | $ 0.00 |  | $ (0.30) |  | $ (0.01) |  | $ (0.30) |
Net income (loss) attributable to COPT common shareholders (in dollars per share) | $ 0.09 | [1] | $ (0.42) | [1] | $ 0.13 | [1] | $ (0.75) | [1]
Diluted EPS: |  |  |  |  |  |  |  |
Loss from continuing operations attributable to COPT common shareholders (in dollars per share) | $ 0.09 | [1] | $ (0.12) | [1] | $ 0.14 | [1] | $ (0.45) | [1]
Discontinued operations attributable to COPT common shareholders (in dollars per share) | $ 0.00 |  | $ (0.30) |  | $ (0.01) |  | $ (0.30) |
Net income (loss) attributable to COPT common shareholders (in dollars per share) | $ 0.09 | [1] | $ (0.42) | [1] | $ 0.13 | [1] | $ (0.75) | [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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