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Pension Benefits (Tables)
6 Months Ended
Jun. 30, 2019
Retirement Benefits, Description [Abstract]  
Schedule of Net Benefit Costs [Table Text Block] The net periodic pension cost for the three and six months ended June 30, 2019 and 2018 were as follows (in thousands):
 
 
 
Three months ended
June 30,
 
 
Six months ended
June 30,
 
 
 
2019
 
 
2018
 
 
2019
 
 
2018
 
Components of net periodic benefit cost
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
374
 
 
$
409
 
 
$
748
 
 
$
818
 
Interest cost
 
 
402
 
 
 
303
 
 
 
804
 
 
 
606
 
Expected return on plan assets
 
 
(762
)
 
 
(711
)
 
 
(1,524
)
 
 
(1,422
)
Recognized net actuarial loss
 
 
366
 
 
 
386
 
 
 
732
 
 
 
772
 
Net periodic pension cost
 
$
380
 
 
$
387
 
 
$
760
 
 
$
774