Inventories (Tables)

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Summary of Inventories

December 31,	2018		2017
(Dollars in thousands)
Raw materials	$	49,571	$	59,353
Work in process		42,886		48,803
Finished goods		83,121		65,843
Inventories, net	$	175,578	$	173,999