Inventories (Tables)

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories consisted of the following:

	(In thousands) December 31,
	2018		2017
Raw materials and supplies	$	89,767	$	65,221
Work in process	9,199		62,584
Finished goods	2,159		10,665
	101,125		138,470
Less progress payments	—		16,309
Total	$	101,125	$	122,161