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Employee Retirement Plans (Tables)
 3 Months Ended
Mar. 28, 2020
Employee Retirement Plans [Abstract]  
Schedule of Costs of Retirement Plans [Table Text Block]
The following table summarizes the company's net periodic pension benefit related to the AGA Group pension plans (in thousands):
 
Three Months Ended
 
Mar 28, 2020
 
Mar 30, 2019
Net Periodic Pension Benefit:
 
 
 
Service cost
$
645

 
$
626

Interest cost
6,418

 
8,432

Expected return on assets
(17,982
)
 
(16,998
)
Amortization of net (gain) loss
837

 
157

Amortization of prior service cost (credit)
638

 
648

 
$
(9,444
)
 
$
(7,135
)