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Goodwill and Intangible Assets - Finite-lived Intangible Assets Weighted-average Useful Lives (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-lived intangible assets    
2019 $ 4,509  
2020 3,640  
2021 3,218  
2022 3,023  
2023 2,489  
Thereafter 18,405  
Net $ 35,284 $ 38,707