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Goodwill and Intangible Assets - Future Amortization Expense of Finite-lived Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2016 $ 3,389  
2017 2,640  
2018 2,069  
2019 1,521  
2020 1,239  
Thereafter 426  
Net intangible assets, end of year $ 11,284 $ 15,142