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Goodwill and Intangible Assets | 9 Months Ended
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Sep. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | 6. Goodwill and Intangible Assets The changes in the carrying amount of goodwill for the nine months ended September 30, 2021 were as follows:
| Goodwill |
| (in thousands) |
Balance as of December 31, 2020 | $ | 939,259 |
Goodwill acquired |  | 554,660 |
Foreign currency translation |  | (9,811 | )
Balance as of September 30, 2021 | $ | 1,484,108 |
Intangible assets consisted of the following:
| September 30, 2021 |
| Weighted- Average Remaining Useful Life - Years |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net |
| (in thousands, except years) |
Domain names |  | 0.9 |  |  | $ | 414 |  |  | $ | 344 |  |  | $ | 70 |
Trademarks |  | 4.6 |  |  |  | 21,384 |  |  |  | 1,517 |  |  |  | 19,867 |
Technology |  | 3.7 |  |  |  | 307,987 |  |  |  | 127,150 |  |  |  | 180,837 |
Customer relationships |  | 5.3 |  |  |  | 53,708 |  |  |  | 3,665 |  |  |  | 50,043 |
Patents |  | 4.2 |  |  |  | 21,195 |  |  |  | 10,881 |  |  |  | 10,314 |
|  |  |  |  | $ | 404,688 |  |  | $ | 143,557 |  |  | $ | 261,131 |
| December 31, 2020 |
| Weighted- Average Remaining Useful Life - Years |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net |
| (in thousands except years) |
Domain names |  | 1.6 |  |  | $ | 414 |  |  | $ | 283 |  |  | $ | 131 |
Technology |  | 3.2 |  |  |  | 206,197 |  |  |  | 111,129 |  |  |  | 95,068 |
Patents |  | 4.9 |  |  |  | 19,860 |  |  |  | 9,130 |  |  |  | 10,730 |
|  |  |  |  | $ | 226,471 |  |  | $ | 120,542 |  |  | $ | 105,929 |
Amortization of intangible assets was $18.1 million and $8.4 million for the three months ended September 30, 2021 and 2020, respectively, and $43.0 million and $23.8 million for the nine months ended September 30, 2021 and 2020, respectively. As of September 30, 2021, the estimated intangible asset amortization expense for the next five years and thereafter is as follows:
| Estimated Amortization |
| (in thousands) |
Remainder of 2021 | $ | 18,977 |
2022 |  | 70,174 |
2023 |  | 64,192 |
2024 |  | 52,542 |
2025 |  | 36,486 |
Thereafter |  | 18,760 |
Total | $ | 261,131 |

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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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