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Inventories

3 Months Ended

Mar. 31, 2019

Note 5. 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):



	March 31,		December 31,
	2019		2018
Raw materials	$	828,733	$	810,766
Supplies		450,584		436,828
Work in progress		184,866		195,224
Finished goods		403,517		416,350
Total inventories	$	1,867,700	$	1,859,168