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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2017
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, 2017 were as follows (in thousands):
| 2017
Goodwill balance at January 1 | $ | 211,927 |
Effect of foreign exchange | 2,418 |
Additions as the result of acquisitions | 19,698 |
Goodwill balance at September 30 | $ | 234,043 |
Other intangible assets | Other intangible assets at September 30, 2017 and December 31, 2016, consisted of the following (in thousands):
| September 30, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Patents | $ | 15,972 |  |  | $ | (3,586 | ) |  | $ | 12,386 |
Distribution agreements | 6,626 |  |  | (4,248 | ) |  | 2,378 |
License agreements | 23,804 |  |  | (4,387 | ) |  | 19,417 |
Trademarks | 16,220 |  |  | (4,342 | ) |  | 11,878 |
Covenants not to compete | 1,028 |  |  | (961 | ) |  | 67 |
Customer lists | 25,942 |  |  | (17,461 | ) |  | 8,481 |
In-process technology | 1,100 |  |  | — |  |  | 1,100 |
Total | $ | 90,692 |  |  | $ | (34,985 | ) |  | $ | 55,707 |
| December 31, 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Patents | $ | 14,130 |  |  | $ | (3,165 | ) |  | $ | 10,965 |
Distribution agreements | 6,626 |  |  | (3,527 | ) |  | 3,099 |
License agreements | 20,695 |  |  | (3,422 | ) |  | 17,273 |
Trademarks | 12,380 |  |  | (3,330 | ) |  | 9,050 |
Covenants not to compete | 1,028 |  |  | (936 | ) |  | 92 |
Customer lists | 22,261 |  |  | (15,401 | ) |  | 6,860 |
Royalty agreements | 267 |  |  | (267 | ) |  | — |
Total | $ | 77,387 |  |  | $ | (30,048 | ) |  | $ | 47,339 |
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, 2017 (in thousands):
Year Ending December 31 |
Remaining 2017 | $ | 6,745 |
2018 | 26,152 |
2019 | 25,678 |
2020 | 24,524 |
2021 | 18,013 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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