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Aggregate annual principal maturities of long-term debt (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Aggregate annual principal maturities of long-term debt  
Annual principal maturities 2016 $ 91
Annual principal maturities 2017 80
Annual principal maturities 2018 52
Annual principal maturities 2019 50
Annual principal maturities 2020 50
Annual principal maturities Thereafter 69
Total Annual principal maturities $ 392