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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020 and 2019, are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
Goodwill balance at January 1 | ​ | $ | 353,193 | ​ | $ | 335,433
Effect of foreign exchange | ​ |  | 1,941 | ​ |  | (199)
Additions and adjustments as the result of acquisitions | ​ |  | 8,399 | ​ |  | 17,959
Goodwill balance at December 31 | ​ | $ | 363,533 | ​ | $ | 353,193
Other intangible assets | Other intangible assets at December 31, 2020 and 2019, consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ | ​ | Gross Carrying | ​ | Accumulated | ​ | Net Carrying
​ |  | Amount |  | Amortization |  | Amount
Patents |  | $ | 22,703 | ​ | $ | (6,863) | ​ | $ | 15,840
Distribution agreements | ​ |  | 8,012 | ​ |  | (6,794) | ​ |  | 1,218
License agreements | ​ |  | 26,987 | ​ |  | (12,746) | ​ |  | 14,241
Trademarks | ​ |  | 30,240 | ​ |  | (9,477) | ​ |  | 20,763
Covenants not to compete | ​ |  | 964 | ​ |  | (964) | ​ |  | —
Customer lists | ​ |  | 39,984 | ​ |  | (28,763) | ​ |  | 11,221
In-process technology | ​ |  | 2,500 | ​ |  | — | ​ |  | 2,500
Total | ​ | $ | 131,390 | ​ | $ | (65,607) | ​ | $ | 65,783
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, 2020 (in thousands):
​ | ​ | ​ | ​
Year Ending December 31, |  | Estimated Amortization Expense
2021 | ​ | $ | 49,701
2022 | ​ |  | 48,496
2023 | ​ |  | 47,323
2024 | ​ | ​ | 44,313
2025 | ​ |  | 42,503

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