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Goodwill and Intangible Assets - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 $ 2,957  
2020 2,174  
2021 2,174  
2022 1,432  
2023 529  
Thereafter 1,252  
Net Carrying Value $ 10,518 $ 15,120