Inventories (Tables)

9 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories were comprised of the following

	September 30, 2021		December 31, 2020
Raw materials	$	21,225	$	17,893
Work-in-process		36,901		31,568
Finished goods		12,480		12,466
Supplies		11,784		11,316
Inventories	$	82,390	$	73,243