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Earnings per Share Earnings per Share (Textuals) (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2013
Sep. 15, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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  
Depositary shares redeemed           2,000,000    
Preferred Stock, Redemption Price Per Share       $ 609.375        
Preferred dividends     $ 0 $ 3,656 $ 4,875      
Preferred Stock, Par or Stated Value Per Share     $ 0.01          
Depositary shares issued               4,000,000
Redemption of preferred shares $ (50,352)     $ (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     $ 86,250          
Debt Instrument, Interest Rate, Stated Percentage     3.00%          
Debt Instrument, Convertible, Conversion Price     $ 32.31          
Debt Conversion, Converted Instrument, Amount     $ 20,309          
Debt Conversion, Converted Instrument, Shares Issued     629,000          
Repayments of Convertible Debt     $ 65,941