Inventories (Tables)

9 Months Ended

Sep. 30, 2018

Inventories [Abstract]

Inventories

Inventories consisted of the following:

	September 30,		December 31,
(in thousands)	2018		2017
Raw materials and supplies	$	33,845	$	36,069
Work-in-process		64,825		76,610
Finished goods		27,075		30,133
Total inventories	$	125,745	$	142,812