(5) Intangible Assets

Intangible assets other than goodwill at June 30, 2011 and December 31, 2010 were as follows:


	2011							2010
			Accumulated							Accumulated
*(in thousands)*	Cost		Amortization			Net		Cost		Amortization			Net
Licenses	$	5,875	$	(5,875	)	$	—	$	5,875	$	(5,875	)	$	—
Patent costs		16,365		(13,820	)		2,545		16,296		(13,632	)		2,664
Acquired technology		11,186		(10,447	)		739		11,064		(10,304	)		760
Internally developed software		15,764		(9,296	)		6,468		9,984		(8,936	)		1,048
Customer relationships		16,215		(960	)		15,255		10,253		(300	)		9,953
Non-compete agreements		7,566		(1,373	)		6,193		3,875		(840	)		3,035
Trade names		4,056		(111	)		3,945		883		(68	)		815
Other		1,482		(1,222	)		260		974		(974	)		—

Total	$	78,509	$	(43,104	)	$	35,405	$	59,204	$	(40,929	)	$	18,275

For the six months ended June 30, 2011 and 2010, the Company capitalized $211 and $192, respectively, of costs incurred to acquire, develop and extend patents in the United States and various other countries.

Amortization expense for intangible assets for quarter and six months ended June 30, 2011 was $1,111 and $1,951, respectively, compared to $339 and $562 for the quarter and six months ended June 30, 2010.

Annual amortization expense for intangible assets for 2011, 2012, 2013, 2014 and 2015 is expected to be $4,607; $4,095; $4,076; $4,069 and $3,954, respectively.