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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016 and 2015, are as follows (in thousands):
| 2016 |  | 2015
Goodwill balance at January 1 | $ | 184,472 |  |  | $ | 184,464 |
Effect of foreign exchange | 82 |  |  | (52 | )
Additions as the result of acquisitions | 27,373 |  |  | 60 |
Goodwill balance at December 31 | $ | 211,927 |  |  | $ | 184,472 |
Other intangible assets | Other intangible assets at December 31, 2016 and 2015, consisted of the following (in thousands):
| 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 |
| 2015
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Patents | $ | 12,014 |  |  | $ | (2,595 | ) |  | $ | 9,419 |
Distribution agreements | 5,626 |  |  | (2,853 | ) |  | 2,773 |
License agreements | 19,109 |  |  | (2,438 | ) |  | 16,671 |
Trademarks | 7,259 |  |  | (2,554 | ) |  | 4,705 |
Covenants not to compete | 1,028 |  |  | (873 | ) |  | 155 |
Customer lists | 20,793 |  |  | (15,023 | ) |  | 5,770 |
Royalty agreements | 267 |  |  | (267 | ) |  | — |
Total | $ | 66,096 |  |  | $ | (26,603 | ) |  | $ | 39,493 |
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, 2016 (in thousands):
Year Ending December 31 |
2017 | $ | 21,800 |
2018 | 21,229 |
2019 | 20,826 |
2020 | 19,732 |
2021 | 13,296 |

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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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