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Debt - Maturities of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
2018 $ 1,487  
2019 1,533  
2020 1,536  
2021 1,517  
2022 1,495  
Thereafter 48,592  
Long term debt $ 56,160 $ 55,653