Inventories (Tables)

6 Months Ended

Jun. 30, 2017

Inventory Disclosure [Abstract]

Schedule of Inventories

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

(in thousands)	June 30, 2017	December 31, 2016
Raw materials	$40,474	$37,691
Work in process	75,917	58,715
Finished goods	35,143	37,500
Total inventories	$151,534	$133,906