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Equity - Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Series C Preferred Stock [Member]    
Class of Stock [Line Items]    
Preferred Stock, Shares Issued 3,000,000 3,000,000
Preferred stock, par value $ 25 $ 25
Payments of Stock Issuance Costs $ 1.6  
Preferred Stock, Shares Outstanding 3,000,000 3,000,000
Series B Preferred Stock [Member]    
Class of Stock [Line Items]    
Preferred Stock, Shares Issued 3,000,000 3,000,000
Preferred Stock, Dividend Rate, Percentage 6.875%  
Preferred stock, par value $ 25 $ 25
Payments of Stock Issuance Costs $ 1.9  
Preferred Stock, Shares Outstanding 3,000,000 3,000,000
Series A Preferred Stock [Member]    
Class of Stock [Line Items]    
Preferred Stock, Shares Issued 2,400,000 2,400,000
Preferred Stock, Dividend Rate, Percentage 5.875%  
Preferred stock, par value $ 25 $ 25
Preferred Stock, Liquidation Preference Per Share $ 25  
Payments of Stock Issuance Costs $ 1.7  
Preferred Stock, Shares Outstanding 2,400,000 2,400,000
July 17, 2024, thereafter [Member] | Series C Preferred Stock [Member]    
Class of Stock [Line Items]    
Preferred Stock, Dividend Variable Rate, Percentage 3.26%  
Up to but excluding July 17, 2024 [Member] | Series C Preferred Stock [Member]    
Class of Stock [Line Items]    
Preferred Stock, Dividend Rate, Percentage 6.00%