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Goodwill and Other Intangible Assets - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 (remaining) $ 2,362  
2020 9,436  
2021 8,924  
2022 7,156  
2023 3,730  
Thereafter 4,539  
Net carrying amount, amortizing intangible assets $ 36,147 $ 29,533