Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Equity (Parenthetical)

v3.10.0.1
Consolidated Statements of Equity (Parenthetical) - shares
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Balance (in units/ shares) 108,848,223 99,608,170 101,292,299 98,498,651
Conversion of common units to common shares (in units/shares) 1,895,627 337,000    
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) 141,633 176,477    
Forward Equity Sale Agreement        
Common shares issued during the period (in shares) 4,527,000      
Common Shares | Common Stock Issued to Public Under At-the-Market Program        
Common shares issued during the period (in shares) 991,664 591,042    
Preferred Shares        
Redemption of preferred shares (in shares/units)   6,900,000