Goodwill and Acquired Intangibles (Tables)

3 Months Ended

Mar. 31, 2018

The changes in the carrying amount of goodwill during the three months ended March 31, 2018 were as follows:



	Gross Carrying Amount
	(In thousands)
Balance as of December 30, 2017	$	666,009
Effect of foreign currency translation	(394		)
Balance as of March 31, 2018	$	665,615

Acquired intangibles as of March 31, 2018 were as follows, excluding intangibles that were fully amortized as of December 30, 2017:



	Gross Carrying Amount		Accumulated Amortization			Acquired Intangibles, Net
	(In thousands)
Existing technology	$	331,162	$	(197,877	)	$	133,285
Agreements and relationships	146,565		(89,725		)	56,840
Tradenames, trademarks and patents	10,718		(7,416		)	3,302
Total acquired intangibles with definite lives	488,445		(295,018		)	193,427
In-process technology	71,500		—			71,500
Total acquired intangibles	$	559,945	$	(295,018	)	$	264,927

Acquired intangibles as of December 30, 2017 were as follows, excluding intangibles that were fully amortized as of December 31, 2016:



	Gross Carrying Amount		Accumulated Amortization			Acquired Intangibles, Net
	(In thousands)
Existing technology	$	342,810	$	(199,529	)	$	143,281
Agreements and relationships	151,063		(90,675		)	60,388
Tradenames, trademarks and patents	10,918		(7,252		)	3,666
Total acquired intangibles with definite lives	504,791		(297,456		)	207,335
In-process technology	71,500		—			71,500
Total acquired intangibles	$	576,291	$	(297,456	)	$	278,835

Amortization of acquired intangibles for the three months ended March 31, 2018 and April 1, 2017 was as follows:



	Three Months Ended
	March 31, 2018		April 1, 2017
	(In thousands)
Cost of product and maintenance	$	10,277	$	10,578
Amortization of acquired intangibles	3,630		3,856
Total amortization of acquired intangibles	$	13,907	$	14,434

Estimated amortization expense for intangible assets with definite lives for the following five fiscal years and thereafter is as follows:



	(In thousands)
2018 – remaining period	$	39,446
2019	46,234
2020	40,619
2021	36,115
2022	17,810
Thereafter	13,203
Total estimated amortization expense	$	193,427