| Goodwill and Intangible Assets |
Goodwill and Intangible Assets The changes in the carrying amount of goodwill for the years ended December 31, 2022 and 2021 were as follows: | | | | | | | Goodwill | | (in thousands) | | Balance as of December 31, 2020 | $ | 939,259 | | | Goodwill acquired | 661,850 | | | Foreign currency translation | (12,657) | | | Balance as of December 31, 2021 | $ | 1,588,452 | | | Goodwill acquired | 69,291 | | | Foreign currency translation | (11,623) | | | Balance as of December 31, 2022 | $ | 1,646,120 | |
Intangible assets consisted of the following: | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2022 | | Weighted-
Average
Remaining
Useful Life -
Years | | Gross
Carrying
Amount | | Accumulated
Amortization | | Net | | | | | | | | | | (in thousands, except years) | | Domain names | 4.0 | | $ | 954 | | | $ | (690) | | | $ | 264 | | | Trademarks | 1.2 | | 800 | | | (478) | | | 322 | | | Technology | 3.1 | | 340,375 | | | (178,427) | | | 161,948 | | | Customer relationships | 5.7 | | 21,000 | | | (6,641) | | | 14,359 | | | Patents | 9.1 | | 39,373 | | | (14,912) | | | 24,461 | | | Other | 1.0 | | 6,000 | | | (2,874) | | | 3,126 | | | | | $ | 408,502 | | | $ | (204,022) | | | $ | 204,480 | |
| | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2021 | | Weighted-
Average
Remaining
Useful Life -
Years | | Gross
Carrying
Amount | | Accumulated
Amortization | | Net | | | | | | | | | | (in thousands, except years) | | Domain names | 4.6 | | $ | 967 | | | $ | (365) | | | $ | 602 | | | Trademarks | 4.3 | | 21,384 | | | (2,613) | | | 18,771 | | | Technology | 3.6 | | 343,800 | | | (142,588) | | | 201,212 | | | Customer relationships | 5.1 | | 53,709 | | | (6,332) | | | 47,377 | | | Patents | 4.0 | | 21,195 | | | (11,503) | | | 9,692 | | | | | $ | 441,055 | | | $ | (163,401) | | | $ | 277,654 | |
Amortization of intangible assets for the years ended December 31, 2022, 2021, and 2020 was $132.3 million, $63.2 million, and $33.5 million, respectively. In 2022, we revised the useful lives of certain customer relationships, trademarks, domain names, and technology, which resulted in a $49.3 million increase to amortization expense for the year ended December 31, 2022. As of December 31, 2022, the estimated intangible asset amortization expense for the next five years and thereafter is as follows: | | | | | | | Estimated
Amortization | | (in thousands) | | Year ending December 31, | | | 2023 | $ | 70,126 | | | 2024 | 57,181 | | | 2025 | 41,106 | | | 2026 | 16,677 | | | 2027 | 7,297 | | | Thereafter | 12,093 | | | Total | $ | 204,480 | |
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