Intangible and Other Assets (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Intangible Assets

Following is a summary of intangible assets as of December 31:

	Weighted Average Life		2012				2011
			Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
Intangibles:
Patents and licenses, software and hardware designs		6 years	$	3,955	$	1,684	$	4,225	$	1,661
Developed technology		10 years		2,782		904		2,782		626
Customer relationships and non-compete		9 years		2,838		1,092		2,838		756
Trademark		Indefinite		833		—		833		—
			$	10,408	$	3,680	$	10,678	$	3,043

Other Assets

Following is a summary of other assets as of December 31:

	2012		2011
Other assets:
Bauxite raw materials:
Inventories	$	13,143	$	23,842
Prepayments		474		1,174
Other assets		220		826
	$	13,837	$	25,842