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Long-Term Debt (Schedule Of Senior Medium-Term Notes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Senior medium-term notes $ 287,560 $ 400,334
Senior Medium Term Notes, Par Amount $ 309,088  
Schedule Of Maturities On Long-Term Debt

(Amounts in thousands)
 
2016
Note type
 
Coupon rate Min
 
Coupon rate Max
 
 
 
 
 
Senior notes
 
4.50
%
 
4.50
%
 
 
 
 
 

  
4.50%    
Debt Instrument [Line Items]    
Senior medium-term notes $ 152,411  
Senior Medium Term Notes, Par Amount $ 163,857  
Schedule Of Maturities On Long-Term Debt March 1, 2017  
Senior Medium-Term Notes four point five zero percent with maturity of June 2023 [Member]    
Debt Instrument [Line Items]    
Senior medium-term notes $ 135,149  
Senior Medium Term Notes, Par Amount $ 145,231  
Schedule Of Maturities On Long-Term Debt June 1, 2023