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Goodwill and Intangible Assets | 3 Months Ended
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Mar. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | 5. Goodwill and Intangible Assets The changes in the carrying amount of goodwill for the three months ended March 31, 2019 were as follows:
| Goodwill |
| (in thousands) |
Balance as of December 31, 2018 | $ | 632,370 |
Foreign currency translation |  | (2,774 | )
Balance as of March 31, 2019 | $ | 629,596 |
Intangible assets consisted of the following:
| March 31, 2019 |
| Weighted- Average Remaining Useful Life - Years |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net |
| (in thousands, except years) |
Domain names |  | 1.5 |  |  | $ | 5,414 |  |  | $ | 4,554 |  |  | $ | 860 |
Trademarks |  | 1.2 |  |  |  | 5,772 |  |  |  | 4,407 |  |  |  | 1,365 |
Acquired developed technology |  | 3.6 |  |  |  | 179,330 |  |  |  | 86,899 |  |  |  | 92,431 |
Customer relationships |  | 2.0 |  |  |  | 15,572 |  |  |  | 8,893 |  |  |  | 6,679 |
Patents |  | 6.6 |  |  |  | 19,710 |  |  |  | 5,659 |  |  |  | 14,051 |
|  |  |  |  | $ | 225,798 |  |  | $ | 110,412 |  |  | $ | 115,386 |
| December 31, 2018 |
| Weighted- Average Remaining Useful Life - Years |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net |
| (in thousands except years) |
Domain names |  | 1.6 |  |  |  | 5,414 |  |  | $ | 4,283 |  |  | $ | 1,131 |
Trademarks |  | 1.4 |  |  |  | 5,772 |  |  |  | 4,076 |  |  |  | 1,696 |
Acquired developed technology |  | 3.8 |  |  |  | 179,791 |  |  |  | 78,729 |  |  |  | 101,062 |
Customer relationships |  | 2.1 |  |  |  | 15,572 |  |  |  | 8,012 |  |  |  | 7,560 |
Patents |  | 6.9 |  |  |  | 19,710 |  |  |  | 5,105 |  |  |  | 14,605 |
|  |  |  |  | $ | 226,259 |  |  | $ | 100,205 |  |  | $ | 126,054 |
Amortization of intangible assets was $10.4 million and $10.8 million for the three months ended March 31, 2019 and 2018, respectively. As of March 31, 2019, the estimated intangible asset amortization expense for the next five years and thereafter is as follows:
| Estimated Amortization |
| (in thousands) |
Remainder of 2019 | $ | 28,229 |
2020 |  | 32,113 |
2021 |  | 25,050 |
2022 |  | 15,411 |
2023 |  | 8,378 |
Thereafter |  | 6,205 |
Total | $ | 115,386 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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