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Debt - Maturities of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt    
2019 $ 1,675  
2020 1,778  
2021 1,962  
2022 1,942  
2023 1,910  
Thereafter 61,709  
Long term debt $ 70,976 $ 56,160