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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Components of Inventories
The components of inventories as of September 30, 2017 and December 31, 2016 were:
 
 
September 30,
2017
 
December 31,
2016
Raw materials and component parts
$
170,677

 
$
154,278

Work in process
38,136

 
34,832

Finished goods
57,892

 
63,749

Total
$
266,705

 
$
252,859