Inventories (Tables)

3 Months Ended

Mar. 31, 2016

Inventories

Schedule of inventories

Inventory consisted of the following (in thousands):

	March 31,		December 31,
	2016		2015
Raw materials	$	353,681	$	419,608
Supplies	390,362		396,349
Work in progress	88,139		90,486
Finished goods	234,641		242,947
Total inventories	$	1,066,823	$	1,149,390