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Contingencies (Tables)
 12 Months Ended
Dec. 31, 2015
Contingencies [Abstract]  
Summary Of Estimated Cost To Replace Annuities For Contingent Liability
   
At December 31,
  
(Dollars in thousands)
  
2015
    
2014
  
The Prudential Insurance Company of America
  
$
142,427
    
$
142,653
  
Unaffiliated life insurance company
  
$
33,062
    
$
31,964