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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2017
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, 2017 were as follows (in thousands):
| 2017
Goodwill balance at January 1 | $ | 211,927 |
Effect of foreign exchange | 372 |
Additions as the result of acquisitions | 7,612 |
Goodwill balance at March 31 | $ | 219,911 |
Other intangible assets | Other intangible assets at March 31, 2017 and December 31, 2016, consisted of the following (in thousands):
| March 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Patents | $ | 14,780 |  |  | $ | (3,288 | ) |  | $ | 11,492 |
Distribution agreements | 6,626 |  |  | (3,770 | ) |  | 2,856 |
License agreements | 20,745 |  |  | (3,745 | ) |  | 17,000 |
Trademarks | 16,786 |  |  | (3,658 | ) |  | 13,128 |
Covenants not to compete | 1,028 |  |  | (944 | ) |  | 84 |
Customer lists | 23,670 |  |  | (16,054 | ) |  | 7,616 |
Total | $ | 83,635 |  |  | $ | (31,459 | ) |  | $ | 52,176 |
| 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 March 31, 2017 (in thousands):
Year Ending December 31 |
Remaining 2017 | $ | 18,457 |
2018 | 24,063 |
2019 | 23,702 |
2020 | 22,619 |
2021 | 16,172 |

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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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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + 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 + Details
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