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Inventories
9 Months Ended
Sep. 30, 2014
Inventory, Net [Abstract]  
Inventories
Inventories
Inventories consist of the following:
September 30, 2014
December 31, 2013
Raw materials
$
67,145

$
69,776

Work-in-process
21,597

22,183

Finished goods
16,722

17,661

Operating and other supplies
136,286

129,995

Inventories
$
241,750

$
239,615


Inventories are stated at the lower of cost or market, using the first-in, first-out method.