Inventories (Tables)

6 Months Ended

Jun. 30, 2019

Inventories

Schedule of Inventories

Inventories are stated at lower of cost or net realizable value. Cost is determined using a weighted average cost method for raw materials and supplies, and on a first-in, first-out basis for other inventory. Inventory consisted of the following (in thousands):

	June 30,		December 31,
	2019		2018
Raw materials	$	784,415	$	810,766
Supplies		471,957		436,828
Work in progress		149,580		195,224
Finished goods		396,807		416,350
Total inventories	$	1,802,759	$	1,859,168