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Intangible Assets, Net - Summary of Intangible Assets, Net (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
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Definite-lived intangible assets: |  |  |  |
Investment contracts and other | $ 487,747 | $ 425,747 |  |
Accumulated amortization | (184,910) | (167,309) |  |
Definite-lived intangible assets, net | 302,837 | 258,438 |  |
Indefinite-lived intangible assets | 43,516 | 43,516 |  |
Total intangible assets, net | $ 346,353 | $ 301,954 | $ 307,017 | $ 38,427

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