Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories consisted of the following:

	(In thousands) December 31,
	2017		2016
Raw materials and supplies	$	65,221	$	64,650
Work in process	62,584		56,806
Finished goods	10,665		9,180
	138,470		130,636
Less progress payments	16,309		10,740
Total	$	122,161	$	119,896