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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in carrying amount of goodwill | The changes in the carrying amount of goodwill for the three-month period ended March 31, 2018 were as follows (in thousands):
| 2018
Goodwill balance at January 1 | $ | 238,147 |
Effect of foreign exchange | 591 |
Additions as the result of acquisitions | 5,387 |
Goodwill balance at March 31 | $ | 244,125 |
Other intangible assets | Other intangible assets at March 31, 2018 and December 31, 2017, consisted of the following (in thousands):
| March 31, 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Patents | $ | 17,356 |  |  | $ | (4,023 | ) |  | $ | 13,333 |
Distribution agreements | 7,262 |  |  | (4,966 | ) |  | 2,296 |
License agreements | 23,920 |  |  | (6,077 | ) |  | 17,843 |
Trademarks | 20,935 |  |  | (5,079 | ) |  | 15,856 |
Covenants not to compete | 1,028 |  |  | (976 | ) |  | 52 |
Customer lists | 35,297 |  |  | (19,397 | ) |  | 15,900 |
In-process technology | 920 |  |  | — |  |  | 920 |
Total | $ | 106,718 |  |  | $ | (40,518 | ) |  | $ | 66,200 |
| 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 March 31, 2018 (in thousands):
Year Ending December 31 |
Remaining 2018 | $ | 36,644 |
2019 | 41,215 |
2020 | 38,160 |
2021 | 30,525 |
2022 | 28,879 |

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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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