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Long-Term Debt - Maturities of Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2018 $ 14,195  
2019 2,995  
2020 143  
2021 0  
2022 and thereafter 100,000  
Total $ 117,333 $ 72,942