Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Components of Inventories

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

	March 31, 2018		December 31, 2017
Raw materials and component parts	$	180,440	$	169,676
Work in process	37,149		33,668
Finished goods	66,287		56,380
Total inventories	$	283,876	$	259,724