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Goodwill and Intangible Assets - Summary of Expected Intangible Amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 3,341  
2019 2,949  
2020 2,581  
2021 2,224  
2022 1,868  
Thereafter 5,649  
Net Book Value $ 18,612 $ 332