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Commitments And Contingencies (Tables)
 6 Months Ended
Jun. 30, 2017
Commitments And 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)
  
2017
    
2016
  
The Prudential
  
$
146,923
    
$
146,507
  
Unaffiliated life insurance company
    
33,107
      
33,860