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Pension Benefits (Tables)
6 Months Ended
Jun. 30, 2017
Pension Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The net periodic pension cost for the three and six months ended June 30, 2017 and 2016 were as follows (in thousands):
 
 
 
 
 
 
Three months ended
June 30,
 
Six months ended
June 30,
  
 
2017
 
2016
 
2017
 
2016
Components of net periodic benefit cost
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
Service cost
 
$
390
 
 
$
368
 
 
$
780
 
 
$
736
 
Interest cost
 
 
326
 
 
 
344
 
 
 
652
 
 
 
688
 
Expected return on plan assets
 
 
(631
 
 
(563
 
 
(1,262
 
 
(1,126
Recognized net actuarial loss
 
 
367
 
 
 
314
 
 
 
734
 
 
 
628
 
Net periodic pension cost
 
$
452
 
 
$
463
 
 
$
904
 
 
$
926