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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

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