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Retirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost and Assumptions Used
The components of net periodic benefit cost are as follows:
 
 
Three Months Ended 
 March 31, 2018
 
Three Months Ended 
 April 1, 2017
(In thousands, except percentages)
 
U.S. Pension
 
Non-U.S. Pension
 
Other Post-Retirement
 
U.S. Pension
 
Non-U.S. Pension
 
Other Post-Retirement
Service Cost
 
$
175

 
$
36

 
$
53

 
$
196

 
$
32

 
$
35

Interest Cost
 
298

 
30

 
43

 
314

 
24

 
39

Expected Return on Plan Assets
 
(322
)
 
(11
)
 
(1
)
 
(335
)
 
(8
)
 
—

Recognized Net Actuarial Loss
 
135

 
16

 
34

 
113

 
9

 
13

Amortization of Prior Service Cost
 
—

 
2

 
22

 
13

 
1

 
21

 
 
$
286

 
$
73

 
$
151

 
$
301

 
$
58

 
$
108

 
 
 
 
 
 
 
 
 
 
 
 
 
The weighted average assumptions used to determine net periodic benefit cost are as follows:
 
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
Discount Rate
 
3.51
%
 
3.80
%
 
3.65
%
 
4.03
%
 
3.39
%
 
4.13
%
Expected Long-Term Return on Plan Assets
 
4.50
%
 
7.43
%
 
7.43
%
 
5.00
%
 
7.72
%
 
7.72
%
Rate of Compensation Increase
 
3.00
%
 
3.69
%
 
3.07
%
 
3.00
%
 
3.40
%
 
3.08
%