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Contingencies (Tables)
 6 Months Ended
Jun. 30, 2016
Contingencies [Abstract]  
Estimated Cost To Replace All Such Annuities For Which The Company Was Contingently Liable
   
At June 30,
    
At December 31,
  
(Dollars in thousands)
  
2016
    
2015
  
The Prudential
  
$
141,562
    
$
142,427
  
Unaffiliated life insurance company
    
32,545
      
33,062