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Retirement Plans (Tables)
 3 Months Ended
Mar. 29, 2014
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
 
March 29, 2014
 
March 30, 2013
 
Domestic
Plans
 
Foreign
Plans
 
OPEB Plans
 
Domestic
Plans
 
Foreign
Plans
 
OPEB Plans
Service cost
$
322

 
$
591

 
$
3

 
$
267

 
$
717

 
$
4

Interest cost
788

 
903

 
49

 
721

 
962

 
50

Expected return on assets
(1,018
)
 
(1,069
)
 
—

 
(887
)
 
(997
)
 
—

Amortization of unrecognized:
 
 
 
 
 
 
 
 
 
 
 
Prior service costs (credits)
3

 
5

 
(2
)
 
—

 
5

 
—

Cumulative actuarial net loss (gain)
—

 
14

 
(11
)
 
49

 
133

 
2

Net periodic benefit cost
$
95

 
$
444

 
$
39

 
$
150

 
$
820

 
$
56