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Properties, Net (Details 5) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2015
Real Estate [Abstract] |  |
Pro forma total revenues | $ 175,996 | $ 345,921
Pro forma net income attributable to COPT common shareholders | $ 13,259 | $ 24,106
Pro Forma EPS, Basic (in dollars per share) | $ 0.14 | $ 0.25
Pro Forma EPS, Diluted (in dollars per share) | $ 0.14 | $ 0.25

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