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Equity	3 Months Ended
	Mar. 31, 2014
Equity [Abstract]
Equity	Equity During the three months ended March 31, 2014, certain COPLP limited partners redeemed 48,498 common units in COPLP for common shares in COPT on the basis of one common share for each common unit. 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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