Intangible Assets

9 Months Ended

Sep. 29, 2013

Intangible Assets

J. Intangible Assets

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

	September 29, 2013
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Useful Life
	(in thousands)
Developed technology	$	358,555	$	180,960	$	177,595		6.3 years
Customer relationships and service and software maintenance contracts		144,971		77,139		67,832		8.0 years
Trade names and trademarks		33,840		13,562		20,278		9.0 years
Customer backlog		1,000		1,000		—		0.4 years
Total intangible assets	$	538,366	$	272,661	$	265,705		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 $54.2 million, respectively, for the three and nine months ended September 29, 2013 and $18.4 million and $55.3 million, respectively, for the three and nine months ended September 30, 2012. Estimated intangible asset amortization expense for each of the five succeeding fiscal years is as follows:

Year	Amortization Expense
	(in thousands)
2013 (remainder)	$	18,052
2014		69,213
2015		52,462
2016		52,462
2017		46,304