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Properties, Net (Details 5) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2015
Real Estate [Abstract] |  |
Pro forma total revenues | $ 152,736 | $ 498,657
Pro forma net income attributable to COPT common shareholders | $ 88,836 | $ 112,941
Pro Forma EPS, Basic (in dollars per share) | $ 0.94 | $ 1.20
Pro Forma EPS, Diluted (in dollars per share) | $ 0.94 | $ 1.20

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