2.	Intangible and Other Assets

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


	Weighted Average Life		2012				2011
	Weighted Average Life		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

Amortization expense for 2012, 2011 and 2010 was $1,224, $1,131 and $1,043, respectively. Estimated amortization expense for each of the ensuing years through December 31, 2017 is $1,117, $1,105, $1,030, $784 and $638, respectively.

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

Bauxite raw materials are used in the production of heavyweight ceramic products. As of December 31, 2012 and 2011, the Company has classified as long-term assets those bauxite raw materials inventories and prepayments in the United States that are not expected to be consumed in production during the upcoming twelve month period.