Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Equity (Parenthetical)

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Consolidated Statements of Equity (Parenthetical) - shares
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Balance (in units/ shares) 94,529,618 87,668,308 93,255,284 87,394,512
Conversion of common units to common shares (in units/ shares) 158,000 78,498    
Exercise of share options (in units/shares) 76,474 51,289    
Share-based compensation issuance, net of redemptions (in units/shares) 149,619 144,009    
Common Shares        
Shares issued to the public under at-the-market program (in units/ shares) 890,241      
Preferred Shares        
Redemption of preferred shares (in units/shares)   2,000,000