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Retirement Plans (Tables)
 3 Months Ended
Apr. 02, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of defined pension plan costs
Components of net periodic benefit cost for the Company’s defined benefit pension plans and OPEB plans are as follows (in thousands):
 
Quarters Ended
 
April 2, 2016
 
April 4, 2015
 
Domestic
Plans
 
Foreign
Plans
 
OPEB Plans
 
Domestic
Plans
 
Foreign
Plans
 
OPEB Plans
Service cost
$
316

 
$
620

 
$
3

 
$
331

 
$
641

 
$
4

Interest cost
827

 
770

 
31

 
806

 
791

 
43

Expected return on assets
(854
)
 
(832
)
 
—

 
(973
)
 
(938
)
 
—

Amortization of unrecognized:
 
 
 
 
 
 
 
 
 
 
 
Prior service costs (credits)
3

 
5

 
(2
)
 
3

 
6

 
(2
)
Cumulative actuarial net loss (gain)
21

 
49

 
(45
)
 
104

 
59

 
(5
)
Net periodic benefit cost
$
313

 
$
612

 
$
(13
)
 
$
271

 
$
559

 
$
40