GOODWILL AND ACQUIRED INTANGIBLES

Goodwill

The changes in the carrying amount of goodwill during the nine months ended September 29, 2018 were as follows:



	Gross Carrying Amount
	(In thousands)
Balance as of December 30, 2017	$	666,009
Effect of foreign currency translation	(4,668		)
Balance as of September 29, 2018	$	661,341

Acquired Intangibles, Net

Acquired intangibles as of September 29, 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	$	330,667	$	(216,345	)	$	114,322
Agreements and relationships	146,359		(96,632		)	49,727
Tradenames, trademarks and patents	10,718		(7,882		)	2,836
Total acquired intangibles with definite lives	487,744		(320,859		)	166,885
In-process technology	71,500		—			71,500
Total acquired intangibles	$	559,244	$	(320,859	)	$	238,385

In-process technology as of September 29, 2018 consisted of acquired projects that, if completed, will contribute to Cadence’s design IP offerings. As of September 29, 2018, these projects were expected to be completed in approximately three to fifteen months. During the nine months ended September 29, 2018, there were no transfers from in-process technology to existing technology.

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 expense from existing technology and maintenance agreements is included in cost of product and maintenance. Amortization of acquired intangibles for the three and nine months ended September 29, 2018 and September 30, 2017 was as follows:



	Three Months Ended				Nine Months Ended
	September 29, 2018		September 30, 2017		September 29, 2018		September 30, 2017
	(In thousands)
Cost of product and maintenance	$	9,505	$	10,165	$	29,773	$	31,611
Amortization of acquired intangibles	3,470		3,453		10,618		11,145
Total amortization of acquired intangibles	$	12,975	$	13,618	$	40,391	$	42,756

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



	(In thousands)
2018 – remaining period	$	12,941
2019	46,208
2020	40,608
2021	36,115
2022	17,810
Thereafter	13,203
Total estimated amortization expense	$	166,885