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Employee Retirement Plans (Tables)
 9 Months Ended
Sep. 28, 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
 
Nine Months Ended
 
 
Sep 28, 2019
 
Sep 29, 2018
 
Sep 28, 2019
 
Sep 29, 2018
Net Periodic Pension Benefit:
 
 

 
 

 
 
 
 
Service cost
 
$
593

 
$
915

 
$
1,839

 
$
2,849

Interest cost
 
7,995

 
7,756

 
24,776

 
24,147

Expected return on assets
 
(16,118
)
 
(18,062
)
 
(49,948
)
 
(56,235
)
Amortization of net (gain) loss
 
149

 
967

 
462

 
3,011

Amortization of prior service cost (credit)
 
614

 
—

 
1,904

 
—

Curtailment loss (gain)
 
185

 
136

 
573

 
1,100

Pension settlement gain
 
—

 
(22
)
 
—

 
(69
)
 
 
$
(6,582
)
 
$
(8,310
)
 
$
(20,394
)
 
$
(25,197
)