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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
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