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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets |
Schedule of changes in goodwill |
|  | Gross carrying |  | Accumulated |  |  |
|  | amount |  | impairment |  | Net amount |
|  | (in thousands) |
Balance at December 31, 2015 and 2016 |  | $ | 238,108 |  | $ | 123,200 |  | $ | 114,908 |
Acquisition |  | 192,223 |  | — |  | 192,223 |
Balance at December 31, 2017 |  | $ | 430,331 |  | $ | 123,200 |  | $ | 307,131 |
Schedule of intangible assets |
|  |  |  | December 31, 2017 |  | December 31, 2016 |
|  | 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 |  | 8.0 |  | $ | 307,588 |  | $ | 133,121 |  | $ | 174,467 |  | $ | 149,198 |  | $ | 113,904 |  | $ | 35,294 |
Customer relationships |  | 11.4 |  | 164,595 |  | 39,336 |  | 125,259 |  | 47,885 |  | 28,659 |  | 19,226 |
In-process R&D |  | — |  | 43,340 |  | — |  | 43,340 |  | — |  | — |  | — |
Trademarks and tradenames |  | 6.4 |  | 30,910 |  | 4,321 |  | 26,589 |  | 2,590 |  | 1,948 |  | 642 |
Indefinite-lived trademark |  | — |  | — |  | — |  | — |  | 2,900 |  | — |  | 2,900 |
Other |  | 2.0 |  | 3,686 |  | 3,498 |  | 188 |  | 2,026 |  | 1,710 |  | 316 |
Total |  | 9.2 |  | $ | 550,119 |  | $ | 180,276 |  | $ | 369,843 |  | $ | 204,599 |  | $ | 146,221 |  | $ | 58,378 |
Schedule of estimated aggregate amortization expense, excluding in-process R&D for intangible assets with definite useful lives |
|  | Amortization |
|  | (in thousands) |
2018 |  | $ | 54,128 |
2019 |  | 57,071 |
2020 |  | 54,382 |
2021 |  | 40,959 |
2022 |  | 26,009 |
Thereafter |  | 93,954 |
Total |  | $ | 326,503 |

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