Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share ("EPS") (Details)

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Earnings Per Share ("EPS") (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Numerator:    
Income from continuing operations $ 9,137 $ 12,685
Gain on sales of real estate, net 2,354 0
Preferred share dividends (6,106) (4,025)
Income from continuing operations attributable to noncontrolling interests (54) (97)
Income from continuing operations attributable to restricted shares (118) (141)
Numerator for basic and diluted EPS from continuing operations attributable to COPT common shareholders 5,213 8,422
Discontinued operations 3,786 (2,450)
Discontinued operations attributable to noncontrolling interests (203) 157
Numerator for basic and diluted EPS on net income attributable to COPT common shareholders $ 8,796 $ 6,129
Denominator (all weighted averages):    
Denominator for basic EPS (common shares) 81,397 71,458
Dilutive effect of share-based compensation awards 52 44
Denominator for basic and diluted EPS 81,449 71,502
Basic EPS:    
Income from continuing operations attributable to COPT common shareholders $ 0.06 [1] $ 0.12 [1]
Discontinued operations attributable to COPT common shareholders (in dollars per share) $ 0.05 [1] $ (0.03) [1]
Net income attributable to COPT common shareholders (in dollars per share) $ 0.11 [1] $ 0.09 [1]
Diluted EPS:    
Income from continuing operations attributable to COPT common shareholders $ 0.06 [1] $ 0.12 [1]
Discontinued operations attributable to COPT common shareholders (in dollars per share) $ 0.05 [1] $ (0.03) [1]
Net income attributable to COPT common shareholders (in dollars per share) $ 0.11 [1] $ 0.09 [1]
[1] Basic and diluted earnings per common share are calculated based on amounts attributable to common shareholders of Corporate Office Properties Trust.