Intangible Assets

3 Months Ended

Mar. 31, 2013

J. Intangible Assets

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


	March 31, 2013
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Useful Life
	(in thousands)
Developed technology	$	357,555	$	155,720	$	201,835		6.3 years
Customer relationships and service and software maintenance contracts		144,971		68,022		76,949		8.0 years
Trade names and trademarks		33,840		11,793		22,047		9.0 years
Customer backlog		1,000		1,000		—		0.4 years

Total intangible assets	$	537,366	$	236,535	$	300,831		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 $18.0 million and $18.4 million, respectively, for the three months ended March 31, 2013 and April 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)	$	54,096
2014		69,102
2015		52,351
2016		52,351
2017		46,193

- Definition

The entire disclosure for all or part of the information related to intangible assets.

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