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Consolidated Statements of Equity (Parenthetical)
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Consolidated Statements of Equity  
Balance (in shares)66,931,58258,342,673
Conversion of common units to common shares83,506620,598
Common shares issued to the public (in shares)4,600,000 
Exercise of share options185,714271,242
Restricted common share redemptions112,683103,721
Balance (in shares)71,986,93659,406,247