Intangible Assets

9 Months Ended

Sep. 30, 2014

(5) Intangible Assets

Intangible assets other than goodwill at September 30, 2014 and December 31, 2013 were as follows:



	2014						2013
(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)	$	—
Patent costs		22,009		(7,519)		14,490		21,545		(5,960)		15,585	6 - 7	3
Acquired technology		60,596		(16,417)		44,179		30,095		(13,615)		16,480	5 - 10	5
Internally developed software		17,851		(13,934)		3,917		18,097		(12,863)		5,234	5	<1
Customer relationships		133,077		(33,708)		99,369		95,793		(18,283)		77,510	5 - 13	5
Non-compete agreements		35,087		(10,457)		24,630		16,848		(6,666)		10,182	3 - 11	3
Trade names		21,193		(4,174)		17,019		9,302		(2,211)		7,091	2 - 10	3
Other		28,149		(5,524)		22,625		11,598		(4,081)		7,517	<1 - 7	2
Intangibles with indefinite lives:
Trademarks		2,110		—		2,110		2,110		—		2,110	N/A	N/A
Total intangible assets	$	325,947	$	(97,608)	$	228,339	$	211,263	$	(69,554)	$	141,709	<1 - 13	4

For the nine months ended September 30, 2014 and 2013, the Company capitalized $547 and $1,502, respectively, of costs incurred to acquire, develop and extend patents in the United States and various other countries.

Amortization expense for intangible assets for the quarter and nine months ended September 30, 2014 was $11,096 and $28,510, respectively, compared to $6,206 and $15,102, respectively, for the quarter and nine months ended September 30, 2013.

Annual amortization expense for intangible assets for 2014, 2015, 2016, 2017 and 2018 is expected to be $41,878, $29,631, $26,573, $23,617 and $18,567, respectively.