Quarterly report pursuant to Section 13 or 15(d)

Properties, net Properties, net (Details 5)

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Properties, net Properties, net (Details 5) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Real Estate [Abstract]        
Pro forma total revenues $ 170,719 $ 144,098 $ 335,159 $ 294,769
Pro forma net income attributable to COPT common shareholders $ 12,620 $ 2,126 $ 22,850 $ 835
Pro Forma EPS, Basic (in dollars per share) $ 0.13 $ 0.02 $ 0.24 $ 0.01
Pro Forma EPS, Diluted (in dollars per share) $ 0.13 $ 0.02 $ 0.24 $ 0.01