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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in carrying amount of goodwill | The changes in the carrying amount of goodwill for the six months ended June 30, 2016 were as follows (in thousands):
| 2016
Goodwill balance at January 1 | $ | 184,472 |
Effect of foreign exchange | 7 |
Additions as the result of acquisitions | 2,555 |
Goodwill balance at June 30 | $ | 187,034 |
Other intangible assets | Other intangible assets at June 30, 2016 and December 31, 2015, consisted of the following (in thousands):
| June 30, 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Patents | $ | 12,914 |  |  | $ | (2,829 | ) |  | $ | 10,085 |
Distribution agreements | 5,626 |  |  | (3,148 | ) |  | 2,478 |
License agreements | 20,194 |  |  | (2,790 | ) |  | 17,404 |
Trademarks | 7,974 |  |  | (2,861 | ) |  | 5,113 |
Covenants not to compete | 1,029 |  |  | (903 | ) |  | 126 |
Customer lists | 21,152 |  |  | (15,771 | ) |  | 5,381 |
Royalty agreements | 267 |  |  | (267 | ) |  | — |
Total | $ | 69,156 |  |  | $ | (28,569 | ) |  | $ | 40,587 |
| December 31, 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 June 30, 2016 (in thousands):
Year Ending December 31 |
Remaining 2016 | $ | 9,313 |
2017 | 16,976 |
2018 | 16,429 |
2019 | 16,101 |
2020 | 15,117 |

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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=26713463&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=26713463&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + 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=26713463&loc=d3e16323-109275 + Details
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