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ACQUIRED INTANGIBLE ASSETS
 9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
ACQUIRED INTANGIBLE ASSETS ACQUIRED INTANGIBLE ASSETS
The following table details acquired intangible assets (in thousands):
Balance at September 30, 2024
Weighted Average Estimated Useful LifeCostAccumulated AmortizationNet
Technology assets5 years$402,500 $(255,427)$147,073 
Customer assets15 years1,487,917 (325,512)1,162,405 
Trade names9 years430,565 (137,697)292,868 
Other9 years13,299 (7,709)5,590 
Total$2,334,281 $(726,345)$1,607,936 
Balance at December 31, 2023
Weighted Average Estimated Useful LifeCostAccumulated AmortizationNet
Technology assets5 years$393,511 $(201,409)$192,102 
Customer assets14 years1,473,970 (237,316)1,236,654 
Trade names9 years428,944 (102,774)326,170 
Other9 years13,299 (6,704)6,595 
Total$2,309,724 $(548,203)$1,761,521 

All intangible assets are amortized over their estimated useful lives.

The change in the carrying value of intangible assets was as follows (in thousands):
Three Months Ended
September 30,		Nine Months Ended
September 30,
2024202320242023
Acquired intangible assets, net, beginning of the period$1,629,183 $1,878,238 $1,761,521 $2,014,034 
Acquisitions7,536 — 7,536 — 
Amortization expense(53,207)(74,845)(172,918)(185,697)
Foreign currency translation and other adjustments24,424 (24,442)11,797 (49,386)
Acquired intangible assets, net, end of the period$1,607,936 $1,778,951 $1,607,936 $1,778,951 

The estimated future amortization expense of intangible assets as of September 30, 2024 was as follows (in thousands):
Remainder of 2024$54,049 
2025211,160 
2026197,093 
2027149,669 
2028145,443 
Thereafter850,522 
Total$1,607,936