Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share ("EPS") and Earnings Per Unit ("EPU") (Details)

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Earnings Per Share ("EPS") and Earnings Per Unit ("EPU") (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator:        
(Loss) income from continuing operations $ (276) $ (32,212) $ 8,783 $ (10,100)
Gain on sales of real estate, net 0 0 2,683 21
Preferred share/unit dividends/distributions (4,490) (6,546) (15,481) (14,738)
Issuance costs associated with redeemed preferred shares/units 0 (1,827) (2,904) (1,827)
(Loss) income from continuing operations attributable to noncontrolling interests (990) 2,249 (2,139) 1,710
Income from continuing operations attributable to restricted shares (97) (111) (317) (357)
Numerator for basic and diluted EPS from continuing operations attributable to COPT common shareholders (5,853) (38,447) (9,375) (25,291)
Discontinued operations (1,724) 11,447 (2,594) 11,410
Discontinued operations attributable to noncontrolling interests 26 (646) (42) (603)
Numerator for basic and diluted EPS on net (loss) income attributable to COPT common shareholders (7,551) (27,646) (12,011) (14,484)
Denominator (all weighted averages):        
Denominator for basic and diluted EPS (in shares/units) 86,760 71,688 84,547 71,590
Basic EPS:        
Loss from continuing operations $ (0.07) [1] $ (0.54) [1] $ (0.11) [1] $ (0.35) [1]
Discontinued operations $ (0.02) [1] $ 0.15 [1] $ (0.03) [1] $ 0.15 [1]
Net income attributable to COPT common shareholders (in dollars per share/unit) $ (0.09) [1] $ (0.39) [1] $ (0.14) [1] $ (0.20) [1]
Diluted EPS:        
Loss from continuing operations $ (0.07) [1] $ (0.54) [1] $ (0.11) [1] $ (0.35) [1]
Discontinued operations $ (0.02) [1] $ 0.15 [1] $ (0.03) [1] $ 0.15 [1]
Net income attributable to COPT common shareholders (in dollars per share/unit) $ (0.09) [1] $ (0.39) [1] $ (0.14) [1] $ (0.20) [1]
Corporate Office Properties, L.P.
        
Numerator:        
(Loss) income from continuing operations (276) (32,212) 8,783 (10,100)
Gain on sales of real estate, net 0 0 2,683 21
Preferred share/unit dividends/distributions (4,655) (6,711) (15,976) (15,233)
Issuance costs associated with redeemed preferred shares/units 0 (1,827) (2,904) (1,827)
(Loss) income from continuing operations attributable to noncontrolling interests (986) 243 (2,025) 829
Income from continuing operations attributable to restricted shares (97) (111) (317) (357)
Numerator for basic and diluted EPU from continuing operations attributable to COPLP common unitholders (6,014) (40,618) (9,756) (26,667)
Discontinued operations (1,724) 11,447 (2,594) 11,410
Discontinued operations attributable to noncontrolling interests (49) (647) (147) (662)
Numerator for basic and diluted EPU on net income attributable to COPLP common unitholders $ (7,787) $ (29,818) $ (12,497) $ (15,919)
Denominator (all weighted averages):        
Denominator for basic and diluted EPS (in shares/units) 90,564 75,921 88,379 75,846
Basic EPS:        
Loss from continuing operations $ (0.07) [2] $ (0.54) [2] $ (0.11) [2] $ (0.35) [2]
Discontinued operations $ (0.02) [2] $ 0.15 [2] $ (0.03) [2] $ 0.14 [2]
Net income attributable to COPT common shareholders (in dollars per share/unit) $ (0.09) [2] $ (0.39) [2] $ (0.14) [2] $ (0.21) [2]
Diluted EPS:        
Loss from continuing operations $ (0.07) [2] $ (0.54) [2] $ (0.11) [2] $ (0.35) [2]
Discontinued operations $ (0.02) [2] $ 0.15 [2] $ (0.03) [2] $ 0.14 [2]
Net income attributable to COPT common shareholders (in dollars per share/unit) $ (0.09) [2] $ (0.39) [2] $ (0.14) [2] $ (0.21) [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.