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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
(Loss) income from continuing operations $ (1,703) $ 9,722 $ 9,059 $ 22,112
Gain on sales of real estate, net 329 21 2,683 21
Preferred share dividends (4,885) (4,167) (10,991) (8,192)
Issuance costs associated with redeemed preferred shares/units (2,904) 0 (2,904) 0
(Loss) income from continuing operations attributable to noncontrolling interests (1,024) (459) (1,149) (539)
Income from continuing operations attributable to restricted shares (102) (105) (220) (246)
Numerator for basic EPS from continuing operations attributable to COPT common shareholders (10,289) 5,012 (3,522) 13,156
Dilutive effect of common units in COPLP on diluted EPS from continuing operations (543) 0 (214) 0
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders (10,832) 5,012 (3,736) 13,156
Discontinued operations (3,031) 2,118 (870) (37)
Discontinued operations attributable to noncontrolling interests 64 (97) (68) 43
Numerator for basic EPS on net (loss) income attributable to COPT common shareholders (13,256) 7,033 (4,460) 13,162
Dilutive effect of common units in COPLP (671) 0 (242) 0
Numerator for diluted EPS on net income attributable to COPT common shareholders (13,927) 7,033 (4,702) 13,162
Denominator (all weighted averages):        
Denominator for basic EPS (common shares) 85,425 71,624 83,422 71,541
Dilutive effect of common units 3,801 0 3,847 0
Dilutive effect of share-based compensation awards 0 25 0 35
Denominator for basic and diluted EPS 89,226 71,649 87,269 71,576
Basic EPS:        
(Loss) income from continuing operations attributable to COPT common shareholders $ (0.12) [1] $ 0.07 [1] $ (0.04) [1] $ 0.18 [1]
Discontinued operations attributable to COPT common shareholders (in dollars per share) $ (0.04) [1] $ 0.03 [1] $ (0.01) [1] $ 0.00 [1]
Net income attributable to COPT common shareholders (in dollars per share) $ (0.16) [1] $ 0.10 [1] $ (0.05) [1] $ 0.18 [1]
Diluted EPS:        
(Loss) income from continuing operations attributable to COPT common shareholders $ (0.12) [1] $ 0.07 [1] $ (0.04) [1] $ 0.18 [1]
Discontinued operations attributable to COPT common shareholders (in dollars per share) $ (0.04) [1] $ 0.03 [1] $ (0.01) [1] $ 0.00 [1]
Net income attributable to COPT common shareholders (in dollars per share) $ (0.16) [1] $ 0.10 [1] $ (0.05) [1] $ 0.18 [1]
Corporate Office Properties, L.P.
        
Numerator:        
(Loss) income from continuing operations (1,703) 9,722 9,059 22,112
Gain on sales of real estate, net 329 21 2,683 21
Preferred share dividends (5,050) (4,332) (11,321) (8,522)
Issuance costs associated with redeemed preferred shares/units (2,904) 0 (2,904) 0
(Loss) income from continuing operations attributable to noncontrolling interests (1,408) 10 (1,039) 586
Income from continuing operations attributable to restricted shares (102) (105) (220) (246)
Numerator for basic and diluted EPU from continuing operations attributable to COPLP common unitholders (10,838) 5,316 (3,742) 13,951
Discontinued operations (3,031) 2,118 (870) (37)
Discontinued operations attributable to noncontrolling interests (65) (9) (98) (15)
Net Income (Loss) Attributable to Common Stockholders, Basic and Diluted $ (13,934) $ 7,425 $ (4,710) $ 13,899
Denominator (all weighted averages):        
Denominator for basic EPS (common shares) 89,226 75,879 87,269 75,808
Dilutive effect of share-based compensation awards 0 25 0 35
Denominator for basic and diluted EPS 89,226 75,904 87,269 75,843
Basic EPS:        
(Loss) income from continuing operations attributable to COPT common shareholders $ (0.12) [2] $ 0.07 [2] $ (0.04) [2] $ 0.18 [2]
Discontinued operations attributable to COPT common shareholders (in dollars per share) $ (0.04) [2] $ 0.03 [2] $ (0.01) [2] $ 0.00 [2]
Net income attributable to COPT common shareholders (in dollars per share) $ (0.16) [2] $ 0.10 [2] $ (0.05) [2] $ 0.18 [2]
Diluted EPS:        
(Loss) income from continuing operations attributable to COPT common shareholders $ (0.12) [2] $ 0.07 [2] $ (0.04) [2] $ 0.18 [2]
Discontinued operations attributable to COPT common shareholders (in dollars per share) $ (0.04) [2] $ 0.03 [2] $ (0.01) [2] $ 0.00 [2]
Net income attributable to COPT common shareholders (in dollars per share) $ (0.16) [2] $ 0.10 [2] $ (0.05) [2] $ 0.18 [2]
[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.