Inventories (Tables)

6 Months Ended

Jun. 30, 2012

Inventory, Net [Abstract]

Schedule of Inventories

Inventories consist of the following:

	June 30, 2012		December 31, 2011
Raw materials	$	33,311	$	41,142
Work-in-process	14,757		15,548
Finished goods	10,634		10,535
Operating and other supplies	99,836		104,736
Inventories	$	158,538	$	171,961