Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Equity (Parenthetical)

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Consolidated Statements of Equity (Parenthetical) - shares
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Balance (in units/ shares) 99,608,170 94,764,786 98,498,651 94,531,512
Conversion of common units to common shares (in units/shares) 337,000 87,000    
Issuance of common units resulting from exercise of share options (in shares or units) 5,000      
Share-based compensation issuance, net of redemptions (in units/shares) 176,477 146,274    
Common Shares        
Issuance of common units resulting from common shares issued under at-the-market program (in units) 591,042      
Preferred Shares        
Redemption of preferred units resulting from redemption of preferred shares (in units/shares) 6,900,000