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Goodwill and Other Intangible Assets - Summary of Intangible Assets, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Definite-lived intangible assets, net: |  |  |  |
Investment contracts and other | $ 487,747 | $ 425,747 |  |
Accumulated amortization | (192,451) | (167,309) |  |
Definite-lived intangible assets, net | 295,296 | 258,438 |  |
Indefinite-lived intangible assets | 43,516 | 43,516 |  |
Total intangible assets, net | $ 338,812 | $ 301,954 | $ 38,427 | $ 40,887

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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