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Retirement and Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Retirement and Benefit Plans [Table Text Block]
The following table presents the pension benefit costs:
 
 
Three Months Ended
March 31
 
2019
 
2018
 
(thousands)
Service cost
$
161

 
$
205

Interest cost
1,816

 
4,011

Expected return on plan assets
(1,474
)
 
(4,588
)
Amortization of actuarial (gain) loss
(43
)
 
821

Net periodic benefit expense
$
460

 
$
449