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LONG-TERM DEBT (Aggregate Future Maturities on Long-Term Debt) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
2018 $ 587
2019 809
2020 808
2021 808
2022 404
Total 3,416
Secured Debt [Member]  
Debt Instrument [Line Items]  
2018 404
2019 809
2020 808
2021 808
2022 404
Total 3,233
Financed Insurance Loan [Member]  
Debt Instrument [Line Items]  
2018 183
Total $ 183