Goodwill and Intangible Assets (Tables)

6 Months Ended

Jul. 05, 2015

Changes in Carrying Amount of Goodwill by Segment

The changes in the carrying amounts of goodwill by segment are as follows:

	Wireless Test		Industrial Automation			System Test Group		Total
	(in thousands)
Balance at December 31, 2014	$	262,922	$	—		$	10,516	$	273,438
Goodwill acquired during period		—		226,501			—		226,501
Foreign currency translation adjustment		—		(4,505	)		—		(4,505	)
Balance at July 5, 2015	$	262,922	$	221,996		$	10,516	$	495,434

Schedule of Amortizable Intangible Assets

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

	July 5, 2015
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Useful Life
	(in thousands)
Developed technology	$	432,656	$	244,514	$	188,142		5.9 years
Customer relationships		155,831		100,500		55,331		7.5 years
Tradenames and trademarks		51,668		16,275		35,393		5.3 years
Non-compete agreement		320		60		260		4.0 years
Customer order backlog		170		170		—		0.3 years
Total intangible assets	$	640,645	$	361,519	$	279,126		6.6 years

	December 31, 2014
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Useful Life
	(in thousands)
Developed technology	$	345,513	$	224,059	$	121,454		6.2 years
Customer relationships		146,635		93,998		52,637		7.7 years
Tradenames and trademarks		30,414		14,205		16,209		9.0 years
Non-compete agreement		320		20		300		4.0 years
Customer order backlog		170		170		—		0.3 years
Total intangible assets	$	523,052	$	332,452	$	190,600		6.8 years

Schedule of Estimated Intangible Asset Amortization Expense

Estimated intangible asset amortization expense for each of the five succeeding fiscal years is as follows:

Year	Amortization Expense
	(in thousands)
2015 (remainder)	$	39,932
2016		79,863
2017		71,269
2018		44,440
2019		23,591
Thereafter		20,031