Consolidated Statements of Equity (Parenthetical)	12 Months Ended
	Dec. 31, 2013
Balance (in units/ shares)	87,394,512
Conversion of common units to common shares	311,343
Exercise of share options (in units/shares)	39,331
Restricted common units/shares redemptions	78,440
Preferred Shares
Shares issued to the public (in units/shares)
Stock redeemed or called during period, value	3,390,000
Common Shares
Shares issued to the public (in units/shares)	4,485,000
Common Stock Issued to Public Under At-the-Market Program
Shares issued to the public (in units/shares)	1,500,000