Inventories (Tables)

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Components of Inventories

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

	September 30, 2018		December 31, 2017
Raw materials and component parts	$	185,764	$	169,676
Work in process	37,094		33,668
Finished goods	64,268		56,380
Total inventories	$	287,126	$	259,724