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Equity - Permanent Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Equity    
Preferred stock stated dividend rate percentage 8.375% 8.375%
Series J Preferred stock    
Equity    
Preferred stock stated dividend rate percentage 8.375% 8.375%
Redemption price of preferred stock (in dollars per share) $ 50.00  
Premium received on preferred stock issued $ 7.5  
Preferred stock unamortized premium $ 3.9 $ 4.2