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Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Inventory, Net [Abstract]  
Schedule of Inventories
Inventories, at December 31, consist of the following:
 
 
2017
 
2016
Raw materials
$
106,210

 
$
59,415

Work-in-process
49,584

 
35,539

Finished goods
40,852

 
26,613

Operating and other supplies
120,823

 
111,996

Inventories
$
317,469

 
$
233,563