Inventories

3 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

Inventories

Inventories

Inventories are comprised of the following: 

	As of March 31, 2020		As of December 31, 2019
	(Dollars in thousands)
Inventories:
Raw materials	$	121,191	$	104,820
Work in process	124,944		137,230
Finished goods	76,488		71,598
Total	$	322,623	$	313,648