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Employee Retirement Plans
6 Months Ended
Jun. 30, 2011
Employee Retirement Plans
7. 
Employee Retirement Plans

The components of the Company’s net pension expense were:
  
   
Three Months Ended June 30,
 
Six Months Ended June 30,
 
   
2011
   
2010
   
2011
   
2010
 
   
(Dollars in thousands)
 
Benefits earned during the period
  $ 321     $ 300     $ 642     $ 585  
Interest cost on projected benefit obligation
    595       612       1,191       1,224  
Expected return on plan assets
    (505 )     (463 )     (1,010 )     (910 )
Net amortization and deferral
    326       362       651       725  
Net pension expense
  $ 737     $ 811     $ 1,474     $ 1,624