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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2024
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, 2024 is detailed as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Cardiovascular | ​ | Endoscopy | ​ | Total
Goodwill balance at January 1 | ​ | $ | 382,240 | ​ | $ | — | ​ | $ | 382,240
Effect of foreign exchange | ​ |  | 211 | ​ |  | — | ​ |  | 211
Additions and adjustments as the result of acquisitions | ​ |  | — | ​ |  | 16,997 | ​ |  | 16,997
Goodwill balance at September 30 | ​ | $ | 382,451 | ​ | $ | 16,997 | ​ | $ | 399,448
Other intangible assets | Other intangible assets at September 30, 2024 and December 31, 2023 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2024
​ | ​ | Gross Carrying | ​ | Accumulated | ​ | Net Carrying
​ |  | Amount |  | Amortization |  | Amount
Patents | ​ | $ | 30,472 | ​ | $ | (12,315) | ​ | $ | 18,157
Distribution agreements | ​ |  | 3,250 | ​ |  | (2,975) | ​ |  | 275
License agreements | ​ |  | 11,599 | ​ |  | (8,979) | ​ |  | 2,620
Trademarks | ​ |  | 40,538 | ​ |  | (23,235) | ​ |  | 17,303
Customer lists | ​ |  | 46,959 | ​ |  | (35,475) | ​ |  | 11,484
Total | ​ | $ | 132,818 | ​ | $ | (82,979) | ​ | $ | 49,839
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | Gross Carrying | ​ | Accumulated | ​ | Net Carrying
​ |  | Amount |  | Amortization |  | Amount
Patents | ​ | $ | 28,877 | ​ | $ | (10,916) | ​ | $ | 17,961
Distribution agreements | ​ |  | 3,250 | ​ |  | (2,919) | ​ |  | 331
License agreements | ​ |  | 11,142 | ​ |  | (8,327) | ​ |  | 2,815
Trademarks | ​ |  | 35,135 | ​ |  | (20,804) | ​ |  | 14,331
Customer lists | ​ |  | 40,367 | ​ |  | (33,921) | ​ |  | 6,446
Total | ​ | $ | 118,771 | ​ | $ | (76,887) | ​ | $ | 41,884
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, 2024 (in thousands):
​ | ​ | ​ | ​
​ |  | Estimated Amortization Expense
Remaining 2024 | ​ | $ | 17,783
2025 | ​ |  | 69,119
2026 | ​ |  | 58,484
2027 | ​ | ​ | 54,947
2028 | ​ |  | 53,409
​

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