Inventories (Tables)

9 Months Ended

Sep. 30, 2017

Inventory Disclosure [Abstract]

Schedule of Inventories

As of September 30, 2017 and December 31, 2016, inventories consisted of the following:

(in thousands)	September 30,   2017	December 31, 2016
Raw materials	$45,142	$37,691
Work in process	83,129	58,715
Finished goods	28,872	37,500
Total inventories	$157,143	$133,906