Intangibles at June 30, 2012 and December 31, 2011 are as follows:



		June 30, 2012
(In thousands)		(Unaudited)						December 31, 2011
		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Capitalized software development costs	$	63,150	$	(36,723)	$	26,427	$	53,086	$	(29,606)	$	23,480
Acquired technology		67,868		(36,991)		30,877		67,918		(32,210)		35,708
Patents		23,199		(8,691)		14,508		21,875		(7,992)		13,883
Other		23,823		(14,956)		8,867		24,614		(13,819)		10,795
	$	178,040	$	(97,361)	$	80,679	$	167,493	$	(83,627)	$	83,866

Software development costs capitalized for the three month periods ended June 30, 2012 and 2011 were $6.1 million and $5.9 million, respectively, and related amortization expense was $3.5 million and $3.3 million, respectively. For the six month periods ended June 30, 2012 and 2011, capitalized software development costs were $10.1 million and $9.8 million, respectively, and related amortization expense was $7.1 million and $6.6 million, respectively. Capitalized software development costs for the three month periods ended June 30, 2012 and 2011 included costs related to stock based compensation of $221,000 and $262,000, respectively. For the six month periods ended June 30, 2012 and 2011, capitalized software development costs included costs related to stock based compensation of $400,000 and $412,000, respectively.

Amortization of capitalized software development costs is computed on an individual product basis for those products available for market and is recognized based on the product’s estimated economic life, generally three years. Acquired core technology and intangible assets are amortized over their useful lives, which range from three to eight years. Patents are amortized using the straight-line method over their estimated period of benefit, generally 10 to 17 years. Total intangible assets amortization expenses were $7.0 million and $5.5 million for the three months ended June 30, 2012 and 2011, respectively, and $13.7 million and $10.7 million for the six month periods ended June 30, 2012 and 2011, respectively.