Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Intangible Assets

Intangible assets consist of the following:

	As of December 31, 2014
	Carrying Value		Accumulated Amortization		Net Intangible
Amortizable intangible assets:
Product technology	$	9,065	$	8,215	$	850
Patents		12,169		4,621		7,548
Other		8,010		7,299		711
Total	$	29,244	$	20,135	$	9,109

	As of December 31, 2013
	Carrying Value		Accumulated Amortization		Net Intangible
Amortizable intangible assets:
Product technology	$	10,917	$	9,710	$	1,207
Patents		10,599		4,118		6,481
Other		8,028		7,604		424
Total	$	29,544	$	21,432	$	8,112

Estimated Amortization Expense

The estimated amortization expense for each of the years 2015 through 2019 and thereafter is as follows:

Years ending December 31,	Amount
2015	$	1,355
2016		1,159
2017		1,084
2018		982
2019		798
Thereafter		3,731
	$	9,109