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Pension Benefits (Tables)
3 Months Ended
Mar. 31, 2018
Pension Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The net periodic pension cost for the three months ended March 31, 2018 and 2017 were as follows (in thousands):
 
 
 
Three months ended
March 31,
  
 
2018
 
2017
Components of net periodic benefit cost
 
 
  
 
 
 
  
 
Service cost
 
$
409
 
 
$
390
 
Interest cost
 
 
303
 
 
 
326
 
Expected return on plan assets
 
 
(711
 
 
(631
Recognized net actuarial loss
 
 
386
 
 
 
367
 
Net periodic pension cost
 
$
387
 
 
$
452