Inventories (Tables)

3 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

Schedule of Inventory, Current

	March 31, 2020		December 31, 2019
Raw materials	$	63,487	$	63,644
Work in progress	53,014		56,065
Finished goods	50,993		58,527
Spares and other	25,984		25,035
	193,478		203,271
Reduction to LIFO cost basis	(35,412)		(31,561)
Total inventories – net	$	158,066	$	171,710