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Manufacturing Restructuring Costs (Tables)
 9 Months Ended
Sep. 27, 2014
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 27,
2014
 
September 28,
2013
 
September 27,
2014
 
September 28,
2013
Balance at the beginning of the period
$
2,109

 
$
2,946

 
$
2,772

 
$
3,387

Decrease
—

 
—

 
(331
)
 
—

Accretion of related lease obligations
120

 
118

 
372

 
394

Payments
(185
)
 
(207
)
 
(769
)
 
(924
)
Balance at the end of the period
$
2,044

 
$
2,857

 
$
2,044

 
$
2,857