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Manufacturing Restructuring Costs (Tables)
 3 Months Ended
Apr. 04, 2015
Restructuring and Related Activities [Abstract]  
Reconciliation of manufacturing restructuring liability
Changes in the manufacturing restructuring liability are as follows (in thousands):  
 
Quarters Ended
 
April 4,
2015
 
March 29,
2014
Balance at the beginning of the period
$
1,960

 
$
2,772

Decreases
—

 
(331
)
Accretion of related lease obligations
114

 
124

Payments
(364
)
 
(399
)
Balance at the end of the period
$
1,710

 
$
2,166