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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in carrying amount of goodwill | ​
​ | ​ | ​ | ​
​ |  | 2020
Goodwill balance at January 1 | ​ | $ | 353,193
Effect of foreign exchange | ​ |  | (215)
Additions and adjustments as the result of acquisitions | ​ |  | 115
Goodwill balance at June 30 | ​ | $ | 353,093
Other intangible assets | Other intangible assets at June 30, 2020 and December 31, 2019 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2020
​ | ​ | Gross Carrying | ​ | Accumulated | ​ | Net Carrying
​ |  | Amount |  | Amortization |  | Amount
Patents | ​ | $ | 24,492 | ​ | $ | (7,863) | ​ | $ | 16,629
Distribution agreements | ​ |  | 5,754 | ​ |  | (4,723) | ​ |  | 1,031
License agreements | ​ |  | 21,957 | ​ |  | (8,698) | ​ |  | 13,259
Trademarks | ​ |  | 30,242 | ​ |  | (10,936) | ​ |  | 19,306
Customer lists | ​ |  | 34,698 | ​ |  | (27,706) | ​ |  | 6,992
In-process technology | ​ |  | 2,500 | ​ |  | — | ​ |  | 2,500
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | $ | 119,643 | ​ | $ | (59,926) | ​ | $ | 59,717
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 June 30, 2020 (in thousands): ​
​ | ​ | ​ | ​
Year Ending December 31, |  | Estimated Amortization Expense
Remaining 2020 | ​ | $ | 29,180
2021 | ​ |  | 51,348
2022 | ​ |  | 50,225
2023 | ​ | ​ | 49,090
2024 | ​ |  | 46,276

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