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GOODWILL AND ACQUIRED INTANGIBLES (Tables)
 6 Months Ended
Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the carrying amount of goodwill
The changes in the carrying amount of goodwill during the six months ended June 30, 2024 were as follows:
 Gross Carrying
Amount
 (In thousands)
Balance as of December 31, 2023$1,535,845 
Goodwill resulting from acquisitions882,813 
Effect of foreign currency translation(911)
Balance as of June 30, 2024$2,417,747 
Schedule of acquired intangibles with finite and indefinite lives (excluding goodwill)
Acquired intangibles as of June 30, 2024 were as follows:
Gross Carrying
Amount		Accumulated
Amortization		Acquired
Intangibles, Net
 (In thousands)
Existing technology$472,024 $(164,369)$307,655 
Agreements and relationships395,646 (62,747)332,899 
Tradenames, trademarks and patents28,940 (5,456)23,484 
Total acquired intangibles$896,610 $(232,572)$664,038 
During the six months ended June 30, 2024, Cadence completed certain projects previously included in in-process technology and transferred $6.8 million to existing technology.
Acquired intangibles as of December 31, 2023 were as follows:
Gross Carrying
Amount		Accumulated
Amortization		Acquired
Intangibles, Net
 (In thousands)
Existing technology$325,710 $(141,659)$184,051 
Agreements and relationships198,259 (61,395)136,864 
Tradenames, trademarks and patents13,460 (4,332)9,128 
Total acquired intangibles with definite lives$537,429 $(207,386)$330,043 
In-process technology6,800 — 6,800 
Total acquired intangibles$544,229 $(207,386)$336,843 
Amortization of acquired intangibles Amortization expense for the three and six months ended June 30, 2024 and June 30, 2023 by condensed consolidated income statement caption was as follows:
 Three Months Ended Six Months Ended
 June 30,
2024		June 30,
2023		June 30,
2024		June 30,
2023
 (In thousands)
Cost of product and maintenance$13,488 $10,618 $24,836 $20,878 
Amortization of acquired intangibles6,667 4,302 12,074 8,569 
Total amortization of acquired intangibles$20,155 $14,920 $36,910 $29,447 
Estimated amortization expense
As of June 30, 2024, the estimated amortization expense for intangible assets with definite lives was as follows for the following five fiscal years and thereafter:
 (In thousands)
2024 - remaining period$53,697 
202593,905 
202688,301 
202785,875 
202881,455 
202966,765 
Thereafter194,040 
Total estimated amortization expense$664,038