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Inventories (Tables)
 3 Months Ended
Apr. 01, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventories
(In thousands)
April 1, 2017
 
December 31, 2016
Work in progress
$
46,261

 
$
50,688

Finished goods
31,514

 
28,480

Total inventories
$
77,775

 
$
79,168