Inventories (Tables)

12 Months Ended

Dec. 31, 2016

Inventory, Net [Abstract]

Schedule of Inventories

Inventories, at December 31, consist of the following:

	2016		2015
Raw materials	$	59,415	$	52,121
Work-in-process	35,539		34,025
Finished goods	26,613		15,988
Operating and other supplies	111,996		129,738
Inventories	$	233,563	$	231,872