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MORTGAGE DEBT AND BANK LOANS (Details textuals) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Mortgage Debt And Bank Loans [Line Items]      
Direct issuance costs for borrowings $ 5.3 $ 3.4 $ 4.8
Danish ship finance      
Mortgage Debt And Bank Loans [Line Items]      
Final maturity facility two years from 2019 to 2021    
Amount of financing agreement $ 79.4    
ABN AMRO      
Mortgage Debt And Bank Loans [Line Items]      
Final maturity facility 2024    
Amount of financing agreement $ 70.0