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Manufacturing Restructuring Costs (Tables)
 9 Months Ended
Sep. 28, 2013
Restructuring and Related Activities [Abstract]  
Reconciliation of manufacturing restructuring liability
Changes in the manufacturing restructuring liability are as follows (in thousands):  
 
Quarters Ended
 
Nine Months Ended
 
September 28,
2013
 
September 29,
2012
 
September 28,
2013
 
September 29,
2012
Balance at the beginning of the period
$
2,946

 
$
3,602

 
$
3,387

 
$
4,086

Accretion of related lease obligations
118

 
141

 
394

 
399

Payments
(207
)
 
(250
)
 
(924
)
 
(992
)
Balance at the end of the period
$
2,857

 
$
3,493

 
$
2,857

 
$
3,493