Inventories (Tables)

3 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

Schedule of Inventories

At March 31, 2020 and December 31, 2019, inventories (in thousands) consisted of the following:

	March 31, 2020		December 31, 2019
Supplies	$	48,300	$	47,277
Raw materials and work in process	36,519		41,167
Finished goods	34,265		35,988
Total inventories	$	119,084	$	124,432