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Senior Notes (Tables)
3 Months Ended
Mar. 31, 2016
Senior Notes [Abstract]  
Schedule Of Outstanding Senior Notes
             
March 31, 2016
   
December 31, 2015
 
             
Consolidated Balance
       
Consolidated Balance
     
(Dollars in thousands)
Date Issued
 
Date Due
 
Principal Amounts
   
Sheet Amount
   
Market Value
   
Sheet Amount
   
Market Value
 
4.868% Senior notes
06/05/2014
 
06/01/2044
   
400,000
   
$
400,000
   
$
393,520
   
$
400,000
   
$
381,204
 
Schedule Of Interest Expense Incurred In Connection With Senior Notes
   
Three Months Ended
 
   
March 31,
 
(Dollars in thousands)
 
2016
   
2015
 
Interest expense incurred
 
$
4,868
   
$
4,868