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Goodwill and Intangible Assets - Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite Lived Intangible Assets Net [Abstract]    
Remainder of 2018 $ 674  
2019 2,626  
2020 2,386  
2021 1,250  
Total $ 6,936 $ 9,048