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Inventories
6 Months Ended
Jun. 28, 2014
Inventory Disclosure [Abstract]  
Inventories
Inventories (in thousands):

 
June 28,
2014
 
December 28,
2013
Work in progress
$
45,026

 
$
32,111

Finished goods
14,244

 
14,111

Total inventories
$
59,270

 
$
46,222