Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory, Current

Inventories consist of the following components (dollars in thousands):

	December 31, 2017		December 31, 2016
Finished goods	$	86,310	$	95,290
Work in process	24,580		22,930
Raw materials	44,460		42,240
Total inventories	$	155,350	$	160,460