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Equity (Details 2) (Preferred Stock Series J, USD $)
Sep. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Preferred Stock Series J
      
Class of Stock [Line Items]      
Preferred stock issued   $ 200,000,000.0  
Preferred stock, stated percentage   4.50%  
Preferred Stock Series, liquidation preference per share (in dollars per share) $ 50 $ 50.00 $ 0
Convertible preferred stock, shares issued upon conversion   3.9087  
Convertible preferred stock, conversion price (in dollars per share)   $ 12.79  
Preferred stock, liquidation redemption price percent of liquidation preference   100.00%