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Goodwill and Intangible Assets - Amortization (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Estimated amortization expense    
2018 (Remainder of year) $ 7,550  
2019 9,636  
2020 9,296  
2021 9,283  
2022 8,975  
Thereafter 15,468  
Total estimated amortization expense $ 60,208 $ 62,736