Inventory (Tables)

9 Months Ended

Sep. 30, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory

The major classes of inventory were as follows:

	September 30, 2017		December 31, 2016
	(in thousands)
Raw materials	$	57,818	$	56,962
Work-in-progress	4,615		12,033
Finished goods	4,736		1,903
Total	$	67,169	$	70,898