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Employee Retirement Plans (Tables)
 6 Months Ended
Jun. 29, 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
 
Six Months Ended
 
 
June 29, 2019
 
June 30, 2018
 
June 29, 2019
 
June 30, 2018
Net Periodic Pension Benefit:
 
 

 
 

 
 
 
 
Service cost
 
$
620

 
$
957

 
$
1,246

 
$
1,934

Interest cost
 
8,349

 
8,113

 
16,781

 
16,391

Expected return on assets
 
(16,832
)
 
(18,895
)
 
(33,830
)
 
(38,173
)
Amortization of net (gain) loss
 
156

 
1,012

 
313

 
2,044

Amortization of prior service cost (credit)
 
642

 
—

 
1,290

 
—

Curtailment loss (gain)
 
388

 
677

 
388

 
964

Pension settlement gain
 
—

 
(23
)
 
—

 
(47
)
 
 
$
(6,677
)
 
$
(8,159
)
 
$
(13,812
)
 
$
(16,887
)