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Goodwill and Intangible Assets - Future Amortization Expense of Finite-lived Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
2019 $ 2,640    
2020 2,069    
2021 1,521    
2022 1,239    
2023 389    
Thereafter 37    
Net intangible assets, end of year $ 7,895 $ 7,900 $ 11,284