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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in carrying amount of goodwill | The changes in the carrying amount of goodwill for the six-month period ended June 30, 2018 were as follows (in thousands):
| 2018
Goodwill balance at January 1 | $ | 238,147 |
Effect of foreign exchange | (906 | )
Additions as the result of acquisitions | 11,757 |
Goodwill balance at June 30 | $ | 248,998 |
Other intangible assets | Other intangible assets at June 30, 2018 and December 31, 2017, consisted of the following (in thousands):
| June 30, 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Patents | $ | 18,196 |  |  | $ | (4,334 | ) |  | $ | 13,862 |
Distribution agreements | 8,192 |  |  | (5,278 | ) |  | 2,914 |
License agreements | 23,845 |  |  | (6,419 | ) |  | 17,426 |
Trademarks | 21,516 |  |  | (5,550 | ) |  | 15,966 |
Covenants not to compete | 1,028 |  |  | (985 | ) |  | 43 |
Customer lists | 35,737 |  |  | (20,680 | ) |  | 15,057 |
In-process technology | 920 |  |  | — |  |  | 920 |
Total | $ | 109,434 |  |  | $ | (43,246 | ) |  | $ | 66,188 |
| December 31, 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 June 30, 2018 (in thousands):
Year Ending December 31 |
Remaining 2018 | $ | 20,132 |
2019 | 39,154 |
2020 | 37,881 |
2021 | 30,488 |
2022 | 28,688 |

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