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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in carrying amount of goodwill | The changes in the carrying amount of goodwill for the years ended December 31, 2021 and 2020, are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020
Goodwill balance at January 1 | ​ | $ | 363,533 | ​ | $ | 353,193
Effect of foreign exchange | ​ |  | (2,078) | ​ |  | 1,941
Additions and adjustments as the result of acquisitions | ​ |  | 286 | ​ |  | 8,399
Goodwill balance at December 31 | ​ | $ | 361,741 | ​ | $ | 363,533
Other intangible assets | Other intangible assets at December 31, 2021 and 2020, consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | Gross Carrying | ​ | Accumulated | ​ | Net Carrying
​ |  | Amount |  | Amortization |  | Amount
Patents | ​ | $ | 26,349 | ​ | $ | (8,315) | ​ | $ | 18,034
Distribution agreements | ​ |  | 3,250 | ​ |  | (2,519) | ​ |  | 731
License agreements | ​ |  | 12,663 | ​ |  | (7,768) | ​ |  | 4,895
Trademarks | ​ |  | 30,242 | ​ |  | (15,256) | ​ |  | 14,986
Customer lists | ​ |  | 34,985 | ​ |  | (31,195) | ​ |  | 3,790
Total | ​ | $ | 107,489 | ​ | $ | (65,053) | ​ | $ | 42,436
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 consists of the following as of December 31, 2021 (in thousands):
​ | ​ | ​ | ​
Year Ending December 31, |  | Estimated Amortization Expense
2022 | ​ | $ | 48,195
2023 | ​ |  | 47,101
2024 | ​ |  | 44,165
2025 | ​ | ​ | 42,396
2026 | ​ |  | 31,843

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