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Earnings per Share Earnings per Share (Textuals) (Details) - USD ($)
$ / shares in Units, $ in Thousands
2 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 01, 2018
Jun. 30, 2013
Sep. 15, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 16, 2017
Apr. 10, 2013
Mar. 15, 2007
Debt Conversion [Line Items]                  
Preferred Stock, Shares Authorized       2,000,000       2,000,000  
Preferred shares redeemed             2,000 2,000  
Depositary shares redeemed             2,000,000    
Preferred Stock, Redemption Price Per Share           $ 609.375      
Preferred dividends       $ 0 $ 0 $ 3,656      
Preferred Stock, Par or Stated Value Per Share       $ 0.01          
Depositary shares issued                 4,000,000
Redemption of preferred shares   $ 50,400       $ 50,420      
Preferred Stock, Dividend Rate, Percentage           9.75%      
Preferred Stock, Shares Issued                 4,000
2017 Convertible Senior Notes [Member]                  
Debt Conversion [Line Items]                  
Convertible Subordinated Debt     $ 57,500            
Debt Instrument, Interest Rate, Stated Percentage     3.25%            
Stock Issued During Period, Shares, Other     2,400,000            
Debt Instrument, Convertible, Conversion Price     $ 23.80            
2018 Convertible Senior Notes [Member]                  
Debt Conversion [Line Items]                  
Convertible Subordinated Debt $ 86,300                
Debt Instrument, Interest Rate, Stated Percentage 3.00%                
Debt Instrument, Convertible, Conversion Price $ 32.31                
Debt Conversion, Converted Instrument, Amount $ 20,300                
Debt Conversion, Converted Instrument, Shares Issued 629,000                
Repayments of Convertible Debt $ 65,900