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Intangible Assets, Net - Summary of Intangible Assets, Net (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
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Definite-lived intangible assets: |  |  |  |
Investment contracts and other | $ 489,570 | $ 489,570 |  |
Accumulated amortization | (245,293) | (222,695) |  |
Definite-lived intangible assets, net | 244,277 | 266,875 |  |
Indefinite-lived intangible assets | 43,516 | 43,516 |  |
Total intangible assets, net | $ 287,793 | $ 310,391 | $ 317,924 | $ 338,812

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