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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018 and 2017, are as follows (in thousands):
| 2018 |  | 2017
Goodwill balance at January 1 | $ | 238,147 |  |  | $ | 211,927 |
Effect of foreign exchange | (1,304 | ) |  | 2,641 |
Additions as the result of acquisitions | 98,590 |  |  | 23,579 |
Goodwill balance at December 31 | $ | 335,433 |  |  | $ | 238,147 |
Other intangible assets | Other intangible assets at December 31, 2018 and 2017, consisted of the following (in thousands):
| 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Patents | $ | 19,378 |  |  | $ | (5,012 | ) |  | $ | 14,366 |
Distribution agreements | 8,012 |  |  | (5,766 | ) |  | 2,246 |
License agreements | 26,930 |  |  | (7,411 | ) |  | 19,519 |
Trademarks | 29,998 |  |  | (6,586 | ) |  | 23,412 |
Covenants not to compete | 1,028 |  |  | (1,000 | ) |  | 28 |
Customer lists | 39,936 |  |  | (23,361 | ) |  | 16,575 |
In-process technology | 3,420 |  |  | — |  |  | 3,420 |
Total | $ | 128,702 |  |  | $ | (49,136 | ) |  | $ | 79,566 |
| 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Patents | $ | 16,528 |  |  | $ | (3,737 | ) |  | $ | 12,791 |
Distribution agreements | 7,262 |  |  | (4,686 | ) |  | 2,576 |
License agreements | 23,783 |  |  | (5,568 | ) |  | 18,215 |
Trademarks | 16,224 |  |  | (4,686 | ) |  | 11,538 |
Covenants not to compete | 1,028 |  |  | (968 | ) |  | 60 |
Customer lists | 31,935 |  |  | (18,482 | ) |  | 13,453 |
In-process technology | 920 |  |  | — |  |  | 920 |
Total | $ | 97,680 |  |  | $ | (38,127 | ) |  | $ | 59,553 |
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, 2018 (in thousands):
Year Ending December 31 |
2019 | $ | 58,035 |
2020 | 55,341 |
2021 | 48,084 |
2022 | 46,648 |
2023 | 45,417 |

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