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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in carrying amount of goodwill | ​
​ | ​ | ​ | ​
​ |  | 2021
Goodwill balance at January 1 | ​ | $ | 363,533
Effect of foreign exchange | ​ |  | (1,533)
Goodwill balance at September 30 | ​ | $ | 362,000
Other intangible assets | Other intangible assets at September 30, 2021 and December 31, 2020 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021
​ | ​ | Gross Carrying | ​ | Accumulated | ​ | Net Carrying
​ |  | Amount |  | Amortization |  | Amount
Patents | ​ | $ | 25,635 | ​ | $ | (7,826) | ​ | $ | 17,809
Distribution agreements | ​ |  | 3,250 | ​ |  | (2,469) | ​ |  | 781
License agreements | ​ |  | 12,678 | ​ |  | (7,478) | ​ |  | 5,200
Trademarks | ​ |  | 30,252 | ​ |  | (14,566) | ​ |  | 15,686
Customer lists | ​ |  | 35,035 | ​ |  | (30,691) | ​ |  | 4,344
Total | ​ | $ | 106,850 | ​ | $ | (63,030) | ​ | $ | 43,820
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | Gross Carrying | ​ | Accumulated | ​ | Net Carrying
​ |  | Amount |  | Amortization |  | Amount
Patents | ​ | $ | 23,669 | ​ | $ | (6,460) | ​ | $ | 17,209
Distribution agreements | ​ |  | 3,250 | ​ |  | (2,319) | ​ |  | 931
License agreements | ​ |  | 14,453 | ​ |  | (6,647) | ​ |  | 7,806
Trademarks | ​ |  | 30,273 | ​ |  | (12,414) | ​ |  | 17,859
Customer lists | ​ |  | 35,154 | ​ |  | (29,103) | ​ |  | 6,051
Total | ​ | $ | 106,799 | ​ | $ | (56,943) | ​ | $ | 49,856
Estimated amortization expense | Estimated amortization expense for the developed technology and other intangible assets for the next five years consisted of the following as of September 30, 2021 (in thousands): ​
​ | ​ | ​ | ​
Year Ending December 31, |  | Estimated Amortization Expense
Remaining 2021 | ​ | $ | 12,279
2022 | ​ |  | 48,158
2023 | ​ |  | 47,060
2024 | ​ | ​ | 44,126
2025 | ​ |  | 42,354

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