Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Equity (Parenthetical)

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Consolidated Statements of Equity (Parenthetical)
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Statement of Stockholders' Equity [Abstract]    
Balance (in shares) 72,011,324 66,931,582
Conversion of common units to common shares 54,550 21,045
Preferred shares issued to the public (in shares) and Common shares issued to the public (in shares) 6,900,000 4,600,000
Exercise of share options 12,667 180,464
Restricted common share redemptions 133,081 107,442
Balance (in shares) 72,084,932 71,891,631