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Intangible Assets - Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Estimated amortization expense    
2020 $ 1,682  
2021 1,688  
2022 1,681  
2023 1,688  
2024 1,695  
Thereafter 3,584  
Net $ 12,018 $ 13,646