Intangible Assets

6 Months Ended

Jun. 30, 2014

(5) Intangible Assets

Intangible assets other than goodwill at June 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		22,211		(7,195)		15,016		21,545		(5,960)		15,585	6 - 7	3
Acquired technology		44,591		(15,410)		29,181		30,095		(13,615)		16,480	5 - 10	5
Internally developed software		17,862		(13,583)		4,279		18,097		(12,863)		5,234	5	<1
Customer relationships		113,067		(28,021)		85,046		95,793		(18,283)		77,510	5 - 13	5
Non-compete agreements		21,010		(8,758)		12,252		16,848		(6,666)		10,182	3 - 11	3
Trade names		10,708		(3,459)		7,249		9,302		(2,211)		7,091	2 - 10	3
Other		23,668		(4,818)		18,850		11,598		(4,081)		7,517	<1 - 7	2
Intangibles with indefinite lives:
Trademarks		5,910		—		5,910		2,110		—		2,110	N/A	N/A
Total intangible assets	$	264,902	$	(87,119)	$	177,783	$	211,263	$	(69,554)	$	141,709	<1 - 13	4

For the six months ended June 30, 2014 and 2013, the Company capitalized $382 and $1,313, 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 six months ended June 30, 2014 was $8,211 and $17,414, respectively, compared to $5,084 and $8,896, respectively, for the quarter and six months ended June 30, 2013.

Annual amortization expense for intangible assets for 2014, 2015, 2016, 2017 and 2018 is expected to be $33,517, $24,496, $21,784, $18,886 and $14,024, respectively.