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Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Temporary Equity [Line Items]    
Preferred Stock, Shares Issued (in shares)   120,000
Preferred Stock, Liquidation Preference, Value   $ 120.0
Preferred Stock, Value, Issued   $ 142.0
Preferred Stock, Dividend Rate, Percentage 8.00%  
Preferred stock annual dividends $ 9.6  
Total shares available for issuance (in shares)   5,393,000
Preferred Stock Initial Conversion Price per Share (in USD per share) $ 22.25  
Common Stock    
Temporary Equity [Line Items]    
Shares issued upon conversion (in shares)   44.9438