Inventories (Tables)

9 Months Ended

Sep. 30, 2012

Inventory, Net [Abstract]

Schedule of Inventories

Inventories consist of the following:

	September 30, 2012		December 31, 2011
Raw materials	$	40,930	$	41,142
Work-in-process	14,953		15,548
Finished goods	7,535		10,535
Operating and other supplies	96,550		104,736
Inventories	$	159,968	$	171,961