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Retirement Plans (Tables)
3 Months Ended
Mar. 30, 2019
Retirement Benefits [Abstract]  
Defined Benefit Plan, Net Periodic Benefit Cost
The summary of the components of net periodic pension costs for the plans for the three months ended March 30, 2019 and March 31, 2018 is as follows (in thousands): 
 
 
 
Three Months Ended
 
 
 
March 30, 2019
 
 
March 31, 2018
 
 
 
U.S.

Pension

Plans
 
 
U.S. Retiree

Healthcare

Plan
 
 
Non-U.S.

Pension

Plans
 
 
U.S.

Pension

Plans
 
 
U.S. Retiree

Healthcare

Plan
 
 
Non-U.S.

Pension

Plans
 
Service cost
 
$
 
 
$
142
 
 
$
1,082
 
 
$
142
 
 
$
132
 
 
$
1,374
 
Interest cost
 
 
13
 
 
 
159
 
 
 
434
 
 
 
1,619
 
 
 
156
 
 
 
428
 
Expected return on plan assets
 
 
 
 
 
(177
)
 
 
(543
)
 
 
(2,785
)
 
 
(178
)
 
 
(493
)
Net amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service credit
 
 
 
 
 
(5
)
 
 
(37
)
 
 
 
 
 
(8
)
 
 
(31
)
Net actuarial loss
 
 
 
 
 
 
 
 
135
 
 
 
769
 
 
 
 
 
 
177
 
Net periodic pension cost (benefit)
 
$
13
 
 
$
119
 
 
$
1,071
 
 
$
(255
)
 
$
102
 
 
$
1,455