Intangible Assets

9 Months Ended

Sep. 30, 2015

(5) Intangible Assets

Intangible assets, net, other than goodwill as of September 30, 2015 and December 31, 2014 were as follows:



	2015						2014
(in thousands)	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net		Useful Life (in years)	Weighted Average Useful Life Remaining (in years)
Intangible assets with finite lives:
Licenses	$	5,875	$	(5,875)	$	—	$	5,875	$	(5,875)	$	—	N/A	N/A
Patent costs		20,872		(8,201)		12,671		20,733		(7,369)		13,364	5-20	3
Acquired technology		73,365		(27,793)		45,572		57,383		(18,241)		39,142	3-10	4
Internally developed software		9,072		(6,599)		2,473		9,073		(5,517)		3,556	1-8	<1
Customer relationships		189,961		(54,018)		135,943		157,139		(36,975)		120,164	3-11	2
Non-compete agreements		19,818		(12,047)		7,771		35,469		(11,784)		23,685	3-11	3
Trade names		29,340		(6,950)		22,390		21,800		(4,455)		17,345	2-10	5
Other		56,675		(16,313)		40,362		39,100		(6,905)		32,195	4-10	1
Intangible assets with indefinite lives:
Trademarks		—		—		—		2,110		—		2,110	N/A	N/A
Total intangible assets	$	404,978	$	(137,796)	$	267,182	$	348,682	$	(97,121)	$	251,561	1-20	4

For the quarter and nine months ended September 30, 2015, the Company capitalized $159 and $719, respectively, of costs incurred to internally develop and extend patents in the United States and various other countries, compared to $165 and $547, respectively, for the quarter and nine months ended September 30, 2014.

For the quarter and nine months ended September 30, 2015, amortization expense on intangible assets was $15,843 and $47,840, respectively, compared to $11,096 and $28,510, respectively, for the quarter and nine months ended September 30, 2014.

For the years ended 2015, 2016, 2017, 2018, and 2019, annual amortization expense on intangible assets is expected to be $67,617, $54,739, $47,227, $39,083 and $28,466, respectively.