Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory, Current

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

	March 31, 2018		December 31, 2017
Finished goods	$	83,730	$	86,310
Work in process	26,780		24,580
Raw materials	46,050		44,460
Total inventories	$	156,560	$	155,350