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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in carrying amount of goodwill | The changes in the carrying amount of goodwill for the nine-month period ended September 30, 2018 were as follows (in thousands):
| 2018
Goodwill balance at January 1 | $ | 238,147
Effect of foreign exchange | (881)
Additions as the result of acquisitions | 11,757
Goodwill balance at September 30 | $ | 249,023
Other intangible assets | Other intangible assets at September 30, 2018 and December 31, 2017, consisted of the following (in thousands):
| September 30, 2018 |  |  |  |
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Patents | $ | 18,676 |  | $ | (4,665) |  | $ | 14,011
Distribution agreements | 8,012 |  | (5,509) |  | 2,503
License agreements | 24,913 |  | (6,895) |  | 18,018
Trademarks | 21,514 |  | (6,039) |  | 15,475
Covenants not to compete | 1,028 |  | (993) |  | 35
Customer lists | 35,590 |  | (21,987) |  | 13,603
In-process technology | 920 |  | — |  | 920
Total | $ | 110,653 |  | $ | (46,088) |  | $ | 64,565
| 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 September 30, 2018 (in thousands):
Year Ending December 31 |
Remaining 2018 | $ | 10,140
2019 | 39,647
2020 | 38,386
2021 | 31,025
2022 | 29,141

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