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Inventories
6 Months Ended
Jun. 30, 2014
Inventory, Net [Abstract]  
Inventories
Inventories
Inventories consist of the following:
June 30, 2014
December 31, 2013
Raw materials
$
54,168

$
69,776

Work-in-process
21,332

22,183

Finished goods
31,171

17,661

Operating and other supplies
136,977

129,995

Inventories
$
243,648

$
239,615


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