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Goodwill and Intangible Assets - Estimated Future Amortization of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 12,667  
2019 11,947  
2020 5,705  
2021 3,207  
2022 2,461  
2023 and thereafter 6,681  
Total $ 42,668 $ 52,870