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Intangible Assets - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 1,609  
2020 1,609  
2021 1,609  
2022 1,609  
2023 1,609  
Thereafter 5,270  
Net Carrying Value $ 13,315 $ 14,794