Inventories (Tables)

12 Months Ended

Dec. 31, 2020

Inventory Disclosure [Abstract]

Schedule of inventory

Inventories consist of the following:

	At December 31,
	2020		2019
In thousands
Raw materials	$	19,502	$	15,012
Contracts in process:
US Government	5,439		6,217
Commercial and other government contracts	59,565		74,035
Contracts and other work in process (including certain general stock materials)	64,237		36,130
Finished goods	36,329		24,959
Inventories	$	185,072	$	156,353