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Consolidated Statements of Equity (Parenthetical)
12 Months Ended
Dec. 31, 2013
Balance (in units/ shares) 87,394,512
Conversion of common units to common shares 311,343
Exercise of share options (in units/shares) 39,331
Restricted common units/shares redemptions 78,440
Preferred Shares
 
Shares issued to the public (in units/shares)   
Stock redeemed or called during period, value 3,390,000
Common Shares
 
Shares issued to the public (in units/shares) 4,485,000
Common Stock Issued to Public Under At-the-Market Program
 
Shares issued to the public (in units/shares) 1,500,000