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Goodwill and Intangible Assets - Reconciliation (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Indefinite-lived Intangible Assets (Excluding Goodwill) $ 3,757 $ 3,757
Finite-Lived Intangible Assets, Net 15,429 18,173
Intangible Assets, Net (Excluding Goodwill) $ 19,186 $ 21,930