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DEBT (Principal Commitments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt [Abstract]    
2019 $ 2,506  
2020 28,932  
2021 14,008  
2022 1,879  
2023 1,846  
Thereafter 83,510  
Net Premium and Debt Issuance Costs 7,558  
Total $ 140,239 $ 149,187