Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories as of March 31, 2018 and December 31, 2017 were as follows:

In thousands	March 31, 2018		December 31, 2017
Raw materials	$	34,023	$	28,672
Work in process	16,013		29,427
Finished goods	24,227		23,901
	74,263		82,000
Less: Progress billings	—		(1,661		)
Total inventories	$	74,263	$	80,339