Inventories (Tables)

9 Months Ended

Sep. 30, 2019

Inventory Disclosure [Abstract]

Summary of Inventories

	September 30, 2019		December 31, 2018
(Dollars in thousands)
Raw materials	$	43,104	$	49,571
Work in process		49,951		42,886
Finished goods		69,024		83,121
Inventories, net	$	162,079	$	175,578