Inventories (Tables)

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Components of Inventories

The components of inventories as of June 30, 2018 and December 31, 2017 were:

	June 30, 2018		December 31, 2017
Raw materials and component parts	$	178,476	$	169,676
Work in process	40,836		33,668
Finished goods	64,542		56,380
Total inventories	$	283,854	$	259,724