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Intangible Asset and Goodwill (Details 4) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Estimated future amortization expense of intangible assets |  |
2019 (remaining 9 months) | $ 14,903 |
2020 | 20,023 |
2021 | 13,317 |
2022 | 2,062 |
2023 | 1,541 |
Thereafter | 2,061 |
Finite-Lived Intangible Assets | 53,907 |
Indefinite-lived Intangible Assets (Excluding Goodwill) | 1,600 |
Intangible Assets, Net (Excluding Goodwill) | $ 55,507 | $ 59,936

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