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Goodwill and Acquired Intangible Assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 2,727  
2019 2,678  
2020 1,103  
2021 492  
2022 492  
Thereafter 411  
Net $ 7,903 $ 7,950