| Changes in carrying amount of goodwill |
The change in the carrying amount of goodwill for the nine-month period ended September 30, 2026 is detailed as follows (in thousands): | | | | | | Nine Months Ended September 30, 2026 | Goodwill balance at January 1 | | $ | 506,837 | Effect of foreign exchange | | | (654) | Additions and adjustments as the result of acquisitions | | | 33,880 | Disposals as the result of divestitures | | | (2,928) | Goodwill balance at September 30 | | $ | 537,135 |
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| Other intangible assets |
Other intangible assets at September 30, 2026 and December 31, 2025 consisted of the following (in thousands): | | | | | | | | | | | | September 30, 2026 | | | Gross Carrying | | Accumulated | | Net Carrying | | | Amount | | Amortization | | Amount | Patents | | $ | 35,179 | | $ | (15,886) | | $ | 19,293 | Distribution agreements | | | 3,250 | | | (3,125) | | | 125 | License agreements | | | 14,113 | | | (11,088) | | | 3,025 | Trademarks | | | 53,943 | | | (28,747) | | | 25,196 | Customer lists | | | 63,025 | | | (42,078) | | | 20,947 | Total | | $ | 169,510 | | $ | (100,924) | | $ | 68,586 |
| | | | | | | | | | | | December 31, 2025 | | | Gross Carrying | | Accumulated | | Net Carrying | | | Amount | | Amortization | | Amount | Patents | | $ | 33,979 | | $ | (14,760) | | $ | 19,219 | Distribution agreements | | | 3,250 | | | (3,069) | | | 181 | License agreements | | | 14,590 | | | (10,218) | | | 4,372 | Trademarks | | | 52,556 | | | (28,293) | | | 24,263 | Customer lists | | | 63,775 | | | (40,096) | | | 23,679 | Total | | $ | 168,150 | | $ | (96,436) | | $ | 71,714 |
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| Estimated amortization expense |
Estimated amortization expense for developed technology and other intangible assets for the next five years consisted of the following as of September 30, 2026 (in thousands): | | | | Year ending December 31, | | Estimated Amortization Expense | Remaining 2026 | | $ | 22,544 | 2027 | | | 88,767 | 2028 | | | 86,917 | 2029 | | | 77,162 | 2030 | | | 65,332 |
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