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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in carrying amount of goodwill | The change in the carrying amount of goodwill by segment for the nine-month period ended September 30, 2025 is detailed as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2025
​ |  | Cardiovascular | ​ | Endoscopy | ​ | Total
Goodwill balance at January 1 | ​ | $ | 446,514 | ​ | $ | 16,997 | ​ | $ | 463,511
Effect of foreign exchange | ​ |  | 2,705 | ​ |  | — | ​ |  | 2,705
Additions and adjustments as the result of acquisitions | ​ |  | 41,211 | ​ |  | — | ​ |  | 41,211
Goodwill balance at September 30 | ​ | $ | 490,430 | ​ | $ | 16,997 | ​ | $ | 507,427
Other intangible assets | Other intangible assets at September 30, 2025 and December 31, 2024 consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2025
​ | ​ | Gross Carrying | ​ | Accumulated | ​ | Net Carrying
​ |  | Amount |  | Amortization |  | Amount
Patents | ​ | $ | 33,425 | ​ | $ | (14,262) | ​ | $ | 19,163
Distribution agreements | ​ |  | 3,250 | ​ |  | (3,050) | ​ |  | 200
License agreements | ​ |  | 12,605 | ​ |  | (9,875) | ​ |  | 2,730
Trademarks | ​ |  | 51,355 | ​ |  | (27,271) | ​ |  | 24,084
Customer lists | ​ |  | 62,546 | ​ |  | (39,142) | ​ |  | 23,404
Total | ​ | $ | 163,181 | ​ | $ | (93,600) | ​ | $ | 69,581
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
​ | ​ | Gross Carrying | ​ | Accumulated | ​ | Net Carrying
​ |  | Amount |  | Amortization |  | Amount
Patents | ​ | $ | 31,489 | ​ | $ | (12,824) | ​ | $ | 18,665
Distribution agreements | ​ |  | 3,250 | ​ |  | (2,994) | ​ |  | 256
License agreements | ​ |  | 11,557 | ​ |  | (9,125) | ​ |  | 2,432
Trademarks | ​ |  | 47,613 | ​ |  | (24,177) | ​ |  | 23,436
Customer lists | ​ |  | 57,933 | ​ |  | (36,223) | ​ |  | 21,710
Total | ​ | $ | 151,842 | ​ | $ | (85,343) | ​ | $ | 66,499
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, 2025 (in thousands):
​ | ​ | ​ | ​
Year ending December 31, |  | Estimated Amortization Expense
Remaining 2025 | ​ | $ | 22,834
2026 | ​ |  | 81,827
2027 | ​ |  | 78,176
2028 | ​ | ​ | 76,520
2029 | ​ |  | 65,133
​

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