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Goodwill and Intangible Assets - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 11,171  
2019 9,122  
2020 6,454  
2021 3,876  
2022 2,766  
Thereafter 5,855  
Total $ 39,244 $ 53,362