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GOODWILL AND ACQUIRED INTANGIBLES (Tables)
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the carrying amount of goodwill
The changes in the carrying amount of goodwill during the three months ended March 31, 2024 were as follows:
 Gross Carrying
Amount
 (In thousands)
Balance as of December 31, 2023$1,535,845 
Goodwill resulting from acquisitions42,480 
Effect of foreign currency translation(3,218)
Balance as of March 31, 2024$1,575,107 
Schedule of acquired intangibles with finite and indefinite lives (excluding goodwill)
Acquired intangibles as of March 31, 2024 were as follows:
Gross Carrying
Amount		Accumulated
Amortization		Acquired
Intangibles, Net
 (In thousands)
Existing technology$329,816 $(150,929)$178,887 
Agreements and relationships203,417 (56,766)146,651 
Tradenames, trademarks and patents13,899 (4,793)9,106 
Total acquired intangibles$547,132 $(212,488)$334,644 
During the three months ended March 31, 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 months ended March 31, 2024 and March 31, 2023 by condensed consolidated income statement caption was as follows:
 Three Months Ended
 March 31,
2024		March 31,
2023
 (In thousands)
Cost of product and maintenance$11,348 $10,260 
Amortization of acquired intangibles5,407 4,267 
Total amortization of acquired intangibles$16,755 $14,527 
Estimated amortization expense
As of March 31, 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$50,873 
202554,698 
202649,102 
202746,595 
202842,441 
202927,957 
Thereafter62,978 
Total estimated amortization expense$334,644