Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Equity (Parenthetical)

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Consolidated Statements of Equity (Parenthetical) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Balance (in units/ shares) 110,241,868 101,292,299 98,498,651 94,531,512
Conversion of common units to common shares (in shares/units) 1,904,615 339,513 87,000  
Exercise of share options (in units/shares)   5,000    
Restricted common units/shares net of redemptions 146,290 179,180 158,912  
Forward Equity Sale Agreement [Member]        
Shares issued to the public (in units/shares) 5,907,000 1,678,913    
Common Stock Issued to Public Under At-the-Market Program [Member]        
Shares issued to the public (in units/shares) 991,664 591,042 3,721,227