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Intangible Assets - Estimated Amortization Expense Schedule (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 4,022  
2019 3,770  
2020 3,311  
2021 2,880  
2022 2,015  
Thereafter 6,542  
Amortizable intangible assets, net Intangible $ 22,540 $ 22,279