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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventories, Net of Valuation Allowances Our inventories consisted of the following (in thousands):
 
As of December 31,
 
2017
 
2016
Finished goods
$
48,771

 
$
43,130

Parts and components
4,583

 
3,900

 
$
53,354

 
$
47,030