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Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories
(In thousands)
June 30,
2018
 
December 30,
2017
Work in progress
$
44,387

 
$
49,642

Finished goods
21,199

 
30,261

Total inventories
$
65,586

 
$
79,903