Inventories (Tables)

6 Months Ended

Jun. 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):

	June 30,		December 31,
	2016		2015
Raw materials	$	415,324	$	419,608
Supplies	388,350		396,349
Work in progress	119,241		90,486
Finished goods	252,801		242,947
Total inventories	$	1,175,716	$	1,149,390