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Defined Benefit Plans (Tables)
3 Months Ended
Mar. 28, 2018
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
 
Quarter Ended
 
March 28, 2018
 
March 29, 2017
 
(In thousands)
Interest cost
$
19

 
$
21

Amortization of net loss
28

 
23

Net periodic benefit cost
$
47

 
$
44