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Employee Retirement Plans (Tables)
9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The components of the Company’s net periodic pension cost were as follows:
 
  
Three Months Ended September 30,
  
Nine Months Ended September 30,
 
  
2018
  
2017
  
2018
  
2017
 
  
(Dollars in thousands)
 
Service cost $126  $141  $427  $423 
Interest cost  554   552   1,652   1,655 
Expected return on plan assets  (741)  (576)  (2,033)  (1,727)
Net amortization and deferral  157   132   476   395 
Net periodic pension cost $96  $249  $522  $746