Inventories

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories

Inventories are comprised of the following: 

	As of September 30, 2018		As of December 31, 2017
	(Dollars in thousands)
Inventories:
Raw materials	$	78,082	$	39,434
Work in process	108,123		85,852
Finished goods	75,779		48,865
Total	$	261,984	$	174,151