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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets |
Schedule of changes in goodwill |
|  | Gross carrying |  | Accumulated |  |  |
|  |  |  | amount |  |  |  | impairment |  |  |  | Net amount |
|  |  |  | (in thousands) |  |  |
Balance at December 31, 2014 |  | $ | 238,158 |  | $ | 123,199 |  | $ | 114,959 |
Purchase price adjustments |  | (51 | ) | — |  | (51 | )
Balance at December 31, 2015 and 2016 |  | $ | 238,107 |  | $ | 123,199 |  | $ | 114,908 |
Schedule of intangible assets |
|  |  |  |  |  | December 31, 2016 |  |  |  | December 31, 2015 |
|  | Weighted |  |  |  |  |  |  |  | Accumulated |  |  |  |  |  |  |  |  |  |  |  | Accumulated |  |  |  |  |
|  | Average Remaining |  |  |  | Gross |  |  |  | Amortization |  |  |  |  |  |  |  | Gross |  |  |  | Amortization |  |  |  |  |
|  | Amortization |  |  |  | Carrying |  |  |  | and |  |  |  | Net |  |  |  | Carrying |  |  |  | and |  |  |  | Net |
|  | Period |  |  |  | Amount |  |  |  | Impairment |  |  |  | Amount |  |  |  | Amount |  |  |  | Impairment |  |  |  | Amount |
|  | (in years) |  | (in thousands) |
Technology |  | 7.3 |  | $ | 149,198 |  | $ | 113,904 |  | $ | 35,294 |  | $ | 222,358 |  | $ | 120,496 |  | $ | 101,862 |
Customer relationships |  | 11.9 |  | 47,885 |  | 28,659 |  | 19,226 |  | 47,885 |  | 22,470 |  | 25,415 |
Trademarks and tradenames |  | 4.3 |  | 2,590 |  | 1,948 |  | 642 |  | 2,730 |  | 1,937 |  | 793 |
Indefinite-lived trademark |  | — |  | 2,900 |  | — |  | 2,900 |  | 2,900 |  | — |  | 2,900 |
Other |  | 2.9 |  | 2,026 |  | 1,710 |  | 316 |  | 6,241 |  | 5,537 |  | 704 |
Total |  | 8.9 |  | $ | 204,599 |  | $ | 146,221 |  | $ | 58,378 |  | $ | 282,114 |  | $ | 150,440 |  | $ | 131,674 |
Schedule of estimated aggregate amortization expense for intangible assets with definite useful lives |
|  |  |  | Amortization |
|  | (in thousands) |
2017 |  | $ | 11,470 |
2018 |  | 9,893 |
2019 |  | 8,608 |
2020 |  | 7,530 |
2021 |  | 5,491 |
Thereafter |  | 12,486 |
Total |  | $ | 55,478 |

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