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Goodwill and Acquired Intangibles
 9 Months Ended
Sep. 26, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND ACQUIRED INTANGIBLES GOODWILL AND ACQUIRED INTANGIBLES
Goodwill
The changes in the carrying amount of goodwill during the nine months ended September 26, 2020 were as follows:
 Gross Carrying
Amount
 (In thousands)
Balance as of December 28, 2019$661,856 
Goodwill resulting from acquisitions120,219 
Effect of foreign currency translation(1,233)
Balance as of September 26, 2020$780,842 
Acquired Intangibles, Net
Acquired intangibles as of September 26, 2020 were as follows, excluding intangibles that were fully amortized as of December 28, 2019:
Gross Carrying
Amount		Accumulated
Amortization		Acquired
Intangibles, Net
 (In thousands)
Existing technology$370,834 $(218,553)$152,281 
Agreements and relationships180,011 (108,736)71,275 
Tradenames, trademarks and patents10,590 (6,393)4,197 
Total acquired intangibles$561,435 $(333,682)$227,753 
During the nine months ended September 26, 2020, Cadence completed the projects previously included in in-process technology and transferred $19.5 million to existing technology.
Acquired intangibles as of December 28, 2019 were as follows, excluding intangibles that were fully amortized as of December 29, 2018:
Gross Carrying
Amount		Accumulated
Amortization		Acquired
Intangibles, Net
 (In thousands)
Existing technology$363,142 $(245,902)$117,240 
Agreements and relationships146,395 (112,565)33,830 
Tradenames, trademarks and patents7,600 (5,795)1,805 
Total acquired intangibles with definite lives517,137 (364,262)152,875 
In-process technology19,500 — 19,500 
Total acquired intangibles$536,637 $(364,262)$172,375 
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 26, 2020 and September 28, 2019 was as follows:
 Three Months Ended Nine Months Ended
 September 26,
2020		September 28,
2019		September 26,
2020		September 28,
2019
 (In thousands)
Cost of product and maintenance$11,447 $9,925 $33,791 $31,078 
Amortization of acquired intangibles4,438 2,874 13,234 9,341 
Total amortization of acquired intangibles$15,885 $12,799 $47,025 $40,419 
Estimated amortization expense for acquired intangible assets with definite lives for the following five fiscal years and thereafter is as follows:
 (In thousands)
2020 - remaining period$17,169 
202161,705 
202243,400 
202327,870 
202426,407 
Thereafter51,202 
Total estimated amortization expense$227,753