Intangible Assets

6 Months Ended

Jun. 30, 2013

J. Intangible Assets

Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet:


	June 30, 2013
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Useful Life
	(in thousands)
Developed technology	$	358,515	$	168,339	$	190,176		6.3 years
Customer relationships and service and software maintenance contracts		144,971		72,581		72,390		8.0 years
Trade names and trademarks		33,840		12,678		21,162		9.0 years
Customer backlog		1,000		1,000		—		0.4 years

Total intangible assets	$	538,326	$	254,598	$	283,728		7.0 years


	December 31, 2012
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Useful Life
	(in thousands)
Developed technology	$	357,555	$	143,126	$	214,429		6.3 years
Customer relationships and service and software maintenance contracts		144,971		63,464		81,507		8.0 years
Trade names and trademarks		33,840		10,909		22,931		9.0 years
Customer backlog		1,000		1,000		—		0.4 years

Total intangible assets	$	537,366	$	218,499	$	318,867		7.0 years

Aggregate intangible asset amortization expense was $18.1 million and $36.1 million, respectively, for the three and six months ended June 30, 2013 and $18.4 million and $36.9 million, respectively, for the three and six months ended July 1, 2012. Estimated intangible asset amortization expense for each of the five succeeding fiscal years is as follows:


Year	Amortization Expense
	(in thousands)
2013 (remainder)	$	36,113
2014		69,208
2015		52,458
2016		52,458
2017		46,299