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Goodwill and Intangible Assets - Finite-lived Intangible Assets Weighted-average Useful Lives (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite-lived intangible assets    
2018 $ 4,447  
2019 4,366  
2020 3,497  
2021 3,076  
2022 2,881  
Thereafter 20,440  
Net $ 38,707 $ 3,386