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INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following (in thousands):
 
June 30, 2018
 
December 30, 2017
Components and parts
$
32,700

 
$
52,837

Work-in-process
11,374

 
15,983

Finished goods
453,740

 
504,968

Inventories
$
497,814

 
$
573,788