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INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following (in thousands):
 
March 31, 2018
 
December 30, 2017
Components and parts
$
30,930

 
$
52,837

Work-in-process
7,511

 
15,983

Finished goods
492,265

 
504,968

Inventories
$
530,706

 
$
573,788