Inventories (Tables)

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Summary of inventories

Inventories consist of the following:

	September 30, 2018			December 31, 2017
	(in thousands)
Raw materials	$	57,306		$	33,498
Work-in-process	23,691			22,040
Finished products	1,956			1,813
Total inventories	82,953			57,351
Less reserves	(3,298		)	(3,204		)
Total inventories, net	$	79,655		$	54,147