Inventories (Tables)

9 Months Ended

Sep. 30, 2016

Inventories

Schedule of inventories

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

	September 30,		December 31,
	2016		2015
Raw materials	$	490,164	$	419,608
Supplies		392,433		396,349
Work in progress		124,428		90,486
Finished goods		268,550		242,947
Total inventories	$	1,275,575	$	1,149,390