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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Components of Inventories

The components of inventories as of June 30, 2019 and December 31, 2018 were:
 
June 30,
2019
 
December 31,
2018
Raw materials and component parts
$
186,117

 
$
178,805

Work in process
28,480

 
37,495

Finished goods
86,409

 
63,695

Total inventories
$
301,006

 
$
279,995