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Consolidated Statements of Equity (Parenthetical)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance (in shares)	80,952,986	72,011,324
Conversion of common units to common shares	248,644	34,550
Exercise of share options	16,453	5,667
Restricted common share redemptions	60,960	97,094
Balance (in shares)	85,758,438	72,037,627
Common Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common shares issued to the public (in shares)	4,485,000

X

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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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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