Intangible Assets

12 Months Ended

Dec. 31, 2013

Intangible Assets

7. INTANGIBLE ASSETS

Intangible assets consist of the following:

	December 31,
	2013			2012
Amortizable intangible assets:
Product technology	$	10,917		$	10,260
Patents		10,599			8,500
Other		8,028			7,749
Total		29,544			26,509
Accumulated amortization		(21,432	)		(19,461	)
Intangible assets - net	$	8,112		$	7,048

Amortization expense was $1,213, $1,207 and $1,318 in 2013, 2012 and 2011, respectively. The estimated amortization expense for each of the years 2014 through 2018 and thereafter is as follows:

Years ending December 31,	Amount
2014	$	1,142
2015		1,090
2016		959
2017		857
2018		607
Thereafter		3,457
	$	8,112