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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 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 six-month period ended June 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 | ​ |  | 2,758 | ​ |  | — | ​ |  | 2,758
Additions and adjustments as the result of acquisitions | ​ |  | 38,286 | ​ |  | — | ​ |  | 38,286
Goodwill balance at June 30 | ​ | $ | 487,558 | ​ | $ | 16,997 | ​ | $ | 504,555
Other intangible assets | Other intangible assets at June 30, 2025 and December 31, 2024 consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2025
​ | ​ | Gross Carrying | ​ | Accumulated | ​ | Net Carrying
​ |  | Amount |  | Amortization |  | Amount
Patents | ​ | $ | 33,078 | ​ | $ | (13,786) | ​ | $ | 19,292
Distribution agreements | ​ |  | 3,250 | ​ |  | (3,031) | ​ |  | 219
License agreements | ​ |  | 12,595 | ​ |  | (9,608) | ​ |  | 2,987
Trademarks | ​ |  | 51,456 | ​ |  | (26,233) | ​ |  | 25,223
Customer lists | ​ |  | 62,676 | ​ |  | (38,214) | ​ |  | 24,462
Total | ​ | $ | 163,055 | ​ | $ | (90,872) | ​ | $ | 72,183
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 June 30, 2025 (in thousands):
​ | ​ | ​ | ​
Year ending December 31, |  | Estimated Amortization Expense
Remaining 2025 | ​ | $ | 45,989
2026 | ​ |  | 81,813
2027 | ​ |  | 78,208
2028 | ​ | ​ | 76,670
2029 | ​ |  | 65,166
​

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