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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Components Of Inventories
The components of inventories as of June 30, 2017 and December 31, 2016 were:
 
 
June 30,
2017
 
December 31,
2016
Raw materials and component parts
$
166,293

 
$
154,278

Work in process
37,910

 
34,832

Finished goods
60,342

 
63,749

Total
$
264,545

 
$
252,859