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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 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 | ​ |  | (723)
Goodwill balance at June 30 | ​ | $ | 362,810
Other intangible assets | Other intangible assets at June 30, 2021 and December 31, 2020 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021
​ | ​ | Gross Carrying | ​ | Accumulated | ​ | Net Carrying
​ |  | Amount |  | Amortization |  | Amount
Patents | ​ | $ | 25,036 | ​ | $ | (7,358) | ​ | $ | 17,678
Distribution agreements | ​ |  | 3,250 | ​ |  | (2,419) | ​ |  | 831
License agreements | ​ |  | 12,710 | ​ |  | (7,198) | ​ |  | 5,512
Trademarks | ​ |  | 30,260 | ​ |  | (13,865) | ​ |  | 16,395
Customer lists | ​ |  | 35,058 | ​ |  | (30,153) | ​ |  | 4,905
Total | ​ | $ | 106,314 | ​ | $ | (60,993) | ​ | $ | 45,321
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 June 30, 2021 (in thousands): ​
​ | ​ | ​ | ​
Year Ending December 31, |  | Estimated Amortization Expense
Remaining 2021 | ​ | $ | 24,572
2022 | ​ |  | 48,149
2023 | ​ |  | 47,050
2024 | ​ | ​ | 44,113
2025 | ​ |  | 42,335
​

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