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Goodwill and Intangible Assets - Amortization (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Estimated amortization expense    
2018 (Remainder of year) $ 2,949  
2019 11,334  
2020 10,833  
2021 10,787  
2022 10,412  
Thereafter 22,362  
Total estimated amortization expense $ 68,677 $ 62,736