Inventories (Tables)

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Summary of inventories

Inventories consist of the following:

	June 30, 2018			December 31, 2017
	(in thousands)
Raw materials	$	50,906		$	33,498
Work-in-process	26,649			22,040
Finished products	3,522			1,813
Total inventories	81,077			57,351
Less reserves	(3,105		)	(3,204		)
Total inventories, net	$	77,972		$	54,147