Quarterly report pursuant to Section 13 or 15(d)

Equity (Details)

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Equity (Details) (USD $)
 6 Months Ended 0 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 16, 2014
Series H Preferred Stock
Jun. 16, 2014
Series H Preferred Stock
Class of Stock [Line Items]        
Preferred stock, dividend rate     7.50%  
Preferred stock, redemption price per share       $ 25
Stock redeemed or called during period (in units/ shares) $ 50,000,000 $ 84,750,000 $ 50,000,000  
Issuance costs associated with redeemed preferred shares     $ 1,800,000  
Number of operating partnerships units converted into common shares (in units) 78,498 279,019    
Number of common shares for each converted common unit (in shares) 1