Quarterly report pursuant to Section 13 or 15(d)

Common and Preferred Stock Issuance (Details)

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Common and Preferred Stock Issuance (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2017
Class of Stock [Line Items]      
Common Stock, Shares, Issued 12,000,000   12,000,000
Common Stock, Par or Stated Value Per Share $ 0.16   $ 0.16
Preferred Stock, Value, Issued $ 2.10   $ 2.10
Preferred Stock, Shares Issued 500,000   500,000
Preferred Stock, Par or Stated Value Per Share $ 1.00   $ 1.00
Preferred Stock, Liquidation Preference Per Share 100   $ 100
Preferred Stock, Dividends, Per Share, Cash Paid $ 1.8125 $ 2.4771  
Proceeds from Issuance of Common Stock and Preferred Stock $ 72.3   $ 72.3
Preferred Stock, Dividend Rate, Percentage     7.25%
Minimum [Member]      
Class of Stock [Line Items]      
Convertible Preferred Stock, Shares Issued upon Conversion 41.4079   41.4079
Maximum [Member]      
Class of Stock [Line Items]      
Convertible Preferred Stock, Shares Issued upon Conversion 47.6190   47.6190