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Inventories
12 Months Ended
Dec. 31, 2015
Inventory, Net [Abstract]  
Inventories
Inventories
Inventories, at December 31, consist of the following:
 
 
2015
2014
Raw materials
$
52,121

$
76,655

Work-in-process
34,025

43,248

Finished goods
15,988

19,969

Operating and other supplies
129,738

143,608

Inventories
$
231,872

$
283,480