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Goodwill and Intangible Assets - Expected Future Amortization of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 976  
2020 976  
2021 969  
2022 946  
2023 946  
Thereafter 2,391  
Net carrying amount, amortized intangible assets $ 7,204 $ 7,384