Inventory (Tables)

6 Months Ended

Jun. 30, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory

The major classes of inventory were as follows:

	June 30, 2017		December 31, 2016
	(in thousands)
Raw materials	$	62,919	$	56,962
Work-in-progress	6,383		12,033
Finished goods	2,115		1,903
Total	$	71,417	$	70,898