Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Earnings Per Share ("EPS") and Earnings Per Unit (“EPU”) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:                      
Income (loss) from continuing operations $ 6,904 $ 21,494 $ 19,195 $ 18,850 $ 19,718 $ (4,829) $ (48,316) $ 8,096 $ 66,443 $ (25,331) $ 120,675
Gain on sales of real estate                 9,890 40,986 68,047
Preferred share/ unit dividends/ distributions 0 0 (3,039) (3,180) (3,640) (3,552) (3,553) (3,552) (6,219) (14,297) (14,210)
Issuance costs associated with redeemed preferred shares $ 0 $ 0 $ (6,847) $ 0 $ (17) $ 0 $ 0 $ 0 (6,847) (17) 0
Income from continuing operations attributable to noncontrolling interests                 (6,242) (4,216) (10,575)
Income from continuing operations attributable to share-based compensation awards                 (449) (419) (706)
Numerator for basic EPS/EPU from continuing operations attributable to COPT/COPLP common shareholders/unitholders                 56,576 (3,294) 163,231
Dilutive effect of common units in COPLP on diluted EPS from continuing operations                 0 0 6,397
Numerator for diluted EPS/EPU from continuing operations attributable to COPT/COPLP common shareholders/unitholders                 56,576 (3,294) 169,628
Discontinued operations                 0 0 156
Discontinued operations attributable to noncontrolling interests                 0 0 (3)
Numerator for basic EPS on net income (loss) attributable to COPT common shareholders                 56,576 (3,294) 163,384
Dilutive effect of common units in COPLP                 0 0 6,403
Numerator for diluted EPS on net income (loss) attributable to COPT common shareholders                 $ 56,576 $ (3,294) $ 169,787
Denominator (all weighted averages):                      
Denominator for basic EPS (common shares)                 98,969 94,502 93,914
Dilutive effect of forward equity sale agreements and share-based compensation awards                 186 0 61
Dilutive effect of common units                 0 0 3,692
Denominator for basic and diluted EPS (common shares)                 99,155 94,502 97,667
Basic EPS:                      
Income (loss) from continuing operations (in dollars per share/unit) [1]                 $ 0.57 $ (0.03) $ 1.74
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) $ 0.10 $ 0.21 $ 0.08 $ 0.18 $ 0.22 $ 0.25 $ (0.54) $ 0.03 0.57 [1] (0.03) [1] 1.74 [1]
Diluted EPS:                      
Income (loss) from continuing operations (in dollars per share/unit) [1]                 0.57 (0.03) 1.74
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) $ 0.10 $ 0.21 $ 0.08 $ 0.18 $ 0.22 $ 0.25 $ (0.54) $ 0.03 $ 0.57 [1] $ (0.03) [1] $ 1.74 [1]
Corporate Office Properties, L.P. [Member]                      
Numerator:                      
Income (loss) from continuing operations $ 6,904 $ 21,494 $ 19,195 $ 18,850 $ 19,718 $ (4,829) $ (48,316) $ 8,096 $ 66,443 $ (25,331) $ 120,675
Gain on sales of real estate                 9,890 40,986 68,047
Preferred share/ unit dividends/ distributions (165) (165) (3,204) (3,345) (3,805) (3,717) (3,718) (3,717) (6,879) (14,957) (14,870)
Issuance costs associated with redeemed preferred shares $ 0 $ 0 $ (6,847) $ 0 $ (17) $ 0 $ 0 $ 0 (6,847) (17) 0
Income from continuing operations attributable to noncontrolling interests                 (3,646) (3,715) (3,523)
Income from continuing operations attributable to share-based compensation awards                 (449) (419) (706)
Numerator for basic and diluted EPS/EPU from continuing operations attributable to COPT/COPLP common shareholders/unitholders                 58,512 (3,453) 169,623
Discontinued operations                 0 0 156
Discontinued operations attributable to noncontrolling interests                 0 0 3
Numerator for basic and diluted EPU on net income (loss) attributable to COPLP common unitholders                 $ 58,512 $ (3,453) $ 169,782
Denominator (all weighted averages):                      
Denominator for basic EPS (common shares)                 102,331 98,135 97,606
Dilutive effect of forward equity sale agreements and share-based compensation awards                 186 0 61
Denominator for basic and diluted EPS (common shares)                 102,517 98,135 97,667
Basic EPS:                      
Income (loss) from continuing operations (in dollars per share/unit) [2]                 $ 0.57 $ (0.04) $ 1.74
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) $ 0.10 $ 0.21 $ 0.08 $ 0.18 $ 0.22 $ 0.25 $ (0.54) $ 0.03 0.57 [2] (0.04) [2] 1.74 [2]
Diluted EPS:                      
Income (loss) from continuing operations (in dollars per share/unit) [2]                 0.57 (0.04) 1.74
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit) $ 0.10 $ 0.21 $ 0.08 $ 0.18 $ 0.22 $ 0.25 $ (0.54) $ 0.03 $ 0.57 [2] $ (0.04) [2] $ 1.74 [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.