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Equity - Dividends Narrative (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Class of Stock        
Common dividends declared (in usd per share) $ 0.125 $ 0.125 $ 0.25 $ 0.250
6.25% series A cumulative redeemable preferred units of the Operating Partnership        
Class of Stock        
Preferred dividends declared (dollars per share) 0.3906      
Series B Preferred Stock        
Class of Stock        
Preferred dividends declared (dollars per share) $ 0.5234