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Retirement and Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Retirement and Benefit Plans [Table Text Block]
The following table presents the pension benefit costs:
 
 
Three Months Ended
September 30
 
Nine Months Ended
September 30
 
2019
 
2018
 
2019
 
2018
 
(thousands)
Service cost
$
163

 
$
196

 
$
485

 
$
598

Interest cost
1,792

 
2,278

 
5,417

 
9,602

Expected return on plan assets
(1,477
)
 
(1,903
)
 
(4,426
)
 
(9,783
)
Amortization of actuarial (gain) loss
(44
)
 
151

 
(131
)
 
1,328

Plan settlement loss
1,342

 
11,252

 
1,342

 
23,255

Net periodic benefit expense
$
1,776

 
$
11,974

 
$
2,687

 
$
25,000