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Equity	6 Months Ended
	Jun. 30, 2016
Equity [Abstract]
Equity	Equity During the six months ended June 30, 2016, certain COPLP limited partners redeemed 26,758 common units in COPLP for an equal number of common shares in COPT. See Note 13 for disclosure of COPT common share and COPLP common unit activity pertaining to our share-based compensation plans.

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The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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