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Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Intangible Assets Net Excluding Goodwill [Abstract] |  |
Indefinite-lived intangible asset | $ 45,275 | $ 45,275
Amortizing intangible asset, Gross carrying value | 84,871 | 84,871
Amortizing intangible asset, Accumulated amortization | (82,035) | (78,633)
Amortizing intangible asset, Net carrying amount | 2,836 | 6,238
Total intangible assets, Gross carrying amount | 130,146 | 130,146
Total intangible assets, Net carrying amount | $ 48,111 | $ 51,513

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