Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Equity (Parenthetical)

v3.3.1.900
Consolidated Statements of Equity (Parenthetical) - shares
 1 Months Ended 12 Months Ended
Jul. 15, 2013
Nov. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Balance (in units/ shares)     94,531,512 93,255,284 87,394,512 80,952,986
Conversion of common units to common shares (in shares/units)     160,160 140,149 311,343  
Shares issued to the public (in units/shares)   5,520,000        
Exercise of share options (in units/shares)     76,474 62,888 39,331  
Restricted common units/shares redemptions     149,353 137,735 105,852  
Preferred Shares [Member]            
Stock redeemed or called during period (in units/ shares)       (2,000,000) (3,390,000)  
Common Shares [Member]            
Shares issued to the public (in units/shares)       5,520,000 4,485,000  
Common Stock Issued to Public Under At-the-Market Program [Member]            
Shares issued to the public (in units/shares) 1,500,000.0   890,241   1,500,000