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LONG‑TERM DEBT - Maturities of Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
2018 $ 15,764  
2019 2,142  
2020 36  
2021 0  
2022 and thereafter 55,000  
Total $ 72,942 $ 179,443