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Long-Term Debt - Maturities of Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
2017 $ 1,778  
2018 14,298  
2019 805  
2020 36  
2021 and thereafter 25,000  
Total $ 41,917 $ 179,443