Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Earnings Per Share ("EPS") and Earnings Per Unit ("EPU") (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Numerator:    
Net income attributable to COPT $ 21,355 $ 6,826
Preferred share/unit dividends/distributions (3,180) (3,552)
Income attributable to share-based compensation awards (125) (118)
Numerator for basic and diluted EPS on net income attributable to COPT common shareholders $ 18,050 $ 3,156
Denominator (all weighted averages):    
Denominator for basic EPS (common shares) 98,411 94,203
Dilutive effect of share-based compensation awards (shares) 155 95
Denominator for diluted EPS (common shares) 98,566 94,298
Basic EPS:    
Net income (loss) attributable to COPT common shareholders - basic (in dollars per share/unit) $ 0.18 $ 0.03
Diluted EPS:    
Net income (loss) attributable to COPT common shareholders - diluted (in dollars per share/unit) $ 0.18 $ 0.03
Corporate Office Properties, L.P.    
Numerator:    
Net income attributable to COPT $ 22,154 $ 7,117
Preferred share/unit dividends/distributions (3,345) (3,717)
Income attributable to share-based compensation awards (125) (118)
Numerator for basic and diluted EPS on net income attributable to COPT common shareholders $ 18,684 $ 3,282
Denominator (all weighted averages):    
Denominator for basic EPS (common shares) 101,857 97,880
Dilutive effect of share-based compensation awards (shares) 155 95
Denominator for diluted EPS (common shares) 102,012 97,975
Basic EPS:    
Net income (loss) attributable to COPT common shareholders - basic (in dollars per share/unit) $ 0.18 $ 0.03
Diluted EPS:    
Net income (loss) attributable to COPT common shareholders - diluted (in dollars per share/unit) $ 0.18 $ 0.03