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Debt - Maturities of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt    
2019 $ 1,457  
2020 1,968  
2021 2,174  
2022 2,189  
2023 2,212  
Thereafter 69,390  
Long term debt $ 79,390 $ 70,976