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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Storage facilities, net $ 2,711,220 $ 2,625,129
Series A Preferred shares, percentage 7.75% 7.75%
Series A Preferred shares, par value (in dollars per share) $ 0.01 $ 0.01
Series A Preferred shares, shares authorized 3,220,000 3,220,000
Series A Preferred shares, shares issued 3,100,000 3,100,000
Series A Preferred shares, shares outstanding 3,100,000 3,100,000
Common shares, par value (in dollars per share) $ 0.01 $ 0.01
Common shares, shares authorized 400,000,000 400,000,000
Common shares, shares issued 167,438,435 163,956,675
Common shares, shares outstanding 167,438,435 163,956,675
VIE    
Storage facilities, net $ 75,448 $ 49,829