COPT Defense Properties Quarterly report pursuant to Section 13 or 15(d)

Equity (Details)

Equity (Details)	3 Months Ended
Equity (Details)	Mar. 31, 2014	Mar. 31, 2013
Equity [Abstract]
Number of operating partnerships units converted into common shares (in units)	48,498	248,644
Number of common shares for each converted common unit (in shares)	1

- Definition

The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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