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Employee Retirement Plans (Tables)
 3 Months Ended
Mar. 30, 2019
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
 
 
March 30, 2019
 
March 31, 2018
Net Periodic Pension Benefit:
 
 

 
 

Service cost
 
$
626

 
$
977

Interest cost
 
8,432

 
8,278

Expected return on assets
 
(16,998
)
 
(19,278
)
Amortization of net (gain) loss
 
157

 
1,032

Amortization of prior service cost (credit)
 
648

 
—

Curtailment loss (gain)
 
—

 
287

Pension settlement gain
 
—

 
(24
)
 
 
$
(7,135
)
 
$
(8,728
)