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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 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 three-month period ended March 31, 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 | ​ |  | 849 | ​ |  | — | ​ |  | 849
Goodwill balance at March 31 | ​ | $ | 447,363 | ​ | $ | 16,997 | ​ | $ | 464,360
Other intangible assets | Other intangible assets at March 31, 2025 and December 31, 2024 consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2025
​ | ​ | Gross Carrying | ​ | Accumulated | ​ | Net Carrying
​ |  | Amount |  | Amortization |  | Amount
Patents | ​ | $ | 32,163 | ​ | $ | (13,278) | ​ | $ | 18,885
Distribution agreements | ​ |  | 3,250 | ​ |  | (3,013) | ​ |  | 237
License agreements | ​ |  | 11,580 | ​ |  | (9,330) | ​ |  | 2,250
Trademarks | ​ |  | 47,627 | ​ |  | (25,170) | ​ |  | 22,457
Customer lists | ​ |  | 57,994 | ​ |  | (37,195) | ​ |  | 20,799
Total | ​ | $ | 152,614 | ​ | $ | (87,986) | ​ | $ | 64,628
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 March 31, 2025 (in thousands):
​ | ​ | ​ | ​
Year ending December 31, |  | Estimated Amortization Expense
Remaining 2025 | ​ | $ | 62,428
2026 | ​ |  | 72,797
2027 | ​ |  | 69,127
2028 | ​ | ​ | 67,728
2029 | ​ |  | 56,158
​

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