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Inventories
9 Months Ended
Sep. 30, 2015
Inventory, Net [Abstract]  
Inventories
Inventories
Inventories consist of the following:
September 30, 2015
December 31, 2014
Raw materials
$
78,066

$
78,599

Work-in-process
49,597

33,941

Finished goods
18,412

19,969

Operating and other supplies
152,784

150,971

Total inventories
$
298,859

$
283,480


Inventories are stated at the lower of cost or market.