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Earnings Per Share ("EPS") (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Numerator: |  |  |  |
Income (loss) from continuing operations | $ 2,592 |  | $ (20,366) |
Gain on sales of real estate, net |  |  | 2,701 |
Preferred share dividends | (4,025) |  | (4,025) |
(Income) loss from continuing operations attributable to noncontrolling interests | (53) |  | 719 |
Income from continuing operations attributable to restricted shares | (141) |  | (282) |
Numerator for basic EPS from continuing operations attributable to COPT common shareholders | (1,627) |  | (21,253) |
Dilutive effect of common units in the Operating Partnership on diluted EPS from continuing operations |  |  | (1,422) |
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders | (1,627) |  | (22,675) |
Numerator for basic EPS from continuing operations attributable to COPT common shareholders | (1,627) |  | (21,253) |
Discontinued operations | 4,385 |  | (901) |
Discontinued operations attributable to noncontrolling interests | (247) |  | 57 |
Numerator for basic EPS on net (loss) income attributable to COPT common shareholders | 2,511 |  | (22,097) |
Dilutive effect of common units in the Operating Partnership |  |  | (1,479) |
Numerator for diluted EPS on net income (loss) attributable to COPT common shareholders | $ 2,511 |  | $ (23,576) |
Denominator (all weighted averages): |  |  |  |
Denominator for basic EPS (common shares) (in shares) | 71,458 |  | 66,340 |
Dilutive effect of common units (in shares) |  |  | 4,396 |
Denominator for diluted EPS (in shares) | 71,458 |  | 70,736 |
Basic EPS: |  |  |  |
Loss from continuing operations attributable to COPT common shareholders (in dollars per share) | $ (0.02) | [1] | $ (0.32) | [1]
Discontinued operations attributable to COPT common shareholders (in dollars per share) | $ 0.06 | [1] | $ (0.01) | [1]
Net income (loss) attributable to COPT common shareholders (in dollars per share) | $ 0.04 | [1] | $ (0.33) | [1]
Diluted EPS: |  |  |  |
Loss from continuing operations attributable to COPT common shareholders | $ (0.02) | [1] | $ (0.32) | [1]
Discontinued operations attributable to COPT common shareholders (in dollars per share) | $ 0.06 | [1] | $ (0.01) | [1]
Net income (loss) attributable to COPT common shareholders (in dollars per share) | $ 0.04 | [1] | $ (0.33) | [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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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible common units using the if-converted method. + References No definition available. + Details
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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 dilutive earnings per share. + References No definition available. + Details
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