Inventories, net (Tables)

3 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

Schedule of Inventories

At March 31, 2020 and December 31, 2019, inventories consisted of the following:

	March 31, 2020		December 31, 2019
	(in thousands)
Raw materials	$	42,045	$	44,218
Work-in-process		2,193		2,809
Finished goods		39,715		42,766
Spare parts		32,330		31,997
Inventories, net	$	116,283	$	121,790