Changes in carrying amount of goodwill |
The changes in the carrying amount of goodwill for the years ended December 31, 2015 and 2014, are as follows (in thousands):
| | | | | | | | | | 2015 | | 2014 | Goodwill balance at January 1 | $ | 184,464 |
| | $ | 184,505 |
| Effect of foreign exchange | (52 | ) | | (41 | ) | Additions as the result of acquisitions | 60 |
| | — |
| Goodwill balance at December 31 | $ | 184,472 |
| | $ | 184,464 |
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Other intangible assets |
Other intangible assets at December 31, 2015 and 2014, consisted of the following (in thousands):
| | | | | | | | | | | | | | 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 |
|
| | | | | | | | | | | | | | 2014 | | Gross Carrying Amount | | Accumulated Amortization | | Net Carrying Amount | Patents | $ | 10,199 |
| | $ | (2,196 | ) | | $ | 8,003 |
| Distribution agreements | 5,376 |
| | (2,285 | ) | | 3,091 |
| License agreements | 8,995 |
| | (1,823 | ) | | 7,172 |
| Trademarks | 7,298 |
| | (2,079 | ) | | 5,219 |
| Covenants not to compete | 1,029 |
| | (636 | ) | | 393 |
| Customer lists | 20,452 |
| | (13,194 | ) | | 7,258 |
| Royalty agreements | 267 |
| | (267 | ) | | — |
| | | | | | | Total | $ | 53,616 |
| | $ | (22,480 | ) | | $ | 31,136 |
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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, 2015 (in thousands):
| | | | | Year Ending December 31 | | 2016 | $ | 15,659 |
| 2017 | 15,515 |
| 2018 | 14,982 |
| 2019 | 14,640 |
| 2020 | 13,807 |
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