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Manufacturing Restructuring Costs (Tables)
 6 Months Ended
Jun. 28, 2014
Restructuring and Related Activities [Abstract]  
Reconciliation of manufacturing restructuring liability
Changes in the manufacturing restructuring liability are as follows (in thousands):  
 
Quarters Ended
 
Six Months Ended
 
June 28,
2014
 
June 29,
2013
 
June 28,
2014
 
June 29,
2013
Balance at the beginning of the period
$
2,166

 
$
3,049

 
$
2,772

 
$
3,387

Decreases
—

 
—

 
(331
)
 
—

Accretion of related lease obligations
128

 
127

 
252

 
276

Payments
(185
)
 
(230
)
 
(584
)
 
(717
)
Balance at the end of the period
$
2,109

 
$
2,946

 
$
2,109

 
$
2,946