Inventories

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Inventories

(4) Inventories

	December 31,
	2018		2017
Raw materials and component parts	$	67,508	$	46,884
Finished goods		93,470		90,174
	$	160,978	$	137,058

Overhead included in inventory aggregated $4.2 million and $5.0 million as of December 31, 2018 and 2017, respectively. Included in inventories is an inventory reserve, which represents the difference between the cost of the inventory and its estimated realizable value, based upon sales forecasts and the physical condition of the inventories. In addition, and as necessary, specific reserves for future known or anticipated events may be established. Inventory reserves aggregated $4.9 million and $5.4 million as of December 31, 2018 and 2017, respectively.