| Finite Lived Intangible Assets |
The following table details acquired intangible assets (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | Balance at September 30, 2024 | | Weighted Average Estimated Useful Life | | Cost | | Accumulated Amortization | | Net | | Technology assets | 5 years | | $ | 402,500 | | | $ | (255,427) | | | $ | 147,073 | | | Customer assets | 15 years | | 1,487,917 | | | (325,512) | | | 1,162,405 | | | Trade names | 9 years | | 430,565 | | | (137,697) | | | 292,868 | | | Other | 9 years | | 13,299 | | | (7,709) | | | 5,590 | | | Total | | | $ | 2,334,281 | | | $ | (726,345) | | | $ | 1,607,936 | |
| | | | | | | | | | | | | | | | | | | | | | | | | Balance at December 31, 2023 | | Weighted Average Estimated Useful Life | | Cost | | Accumulated Amortization | | Net | | Technology assets | 5 years | | $ | 393,511 | | | $ | (201,409) | | | $ | 192,102 | | | Customer assets | 14 years | | 1,473,970 | | | (237,316) | | | 1,236,654 | | | Trade names | 9 years | | 428,944 | | | (102,774) | | | 326,170 | | | Other | 9 years | | 13,299 | | | (6,704) | | | 6,595 | | | Total | | | $ | 2,309,724 | | | $ | (548,203) | | | $ | 1,761,521 | |
The change in the carrying value of intangible assets was as follows (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended
September 30, | | Nine Months Ended
September 30, | | 2024 | | 2023 | | 2024 | | 2023 | | Acquired intangible assets, net, beginning of the period | $ | 1,629,183 | | | $ | 1,878,238 | | | $ | 1,761,521 | | | $ | 2,014,034 | | | Acquisitions | 7,536 | | | — | | | 7,536 | | | — | | | Amortization expense | (53,207) | | | (74,845) | | | (172,918) | | | (185,697) | | | Foreign currency translation and other adjustments | 24,424 | | | (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 | |
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