Inventories (Tables)

12 Months Ended

Dec. 31, 2019

Inventory Disclosure [Abstract]

Schedule of Inventories

	2019		2018
Raw materials	$	18,011	$	19,615
Work-in-progress		35,942		42,339
Finished goods		17,159		20,650
Supplies		11,177		11,592
Inventories	$	82,289	$	94,196