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NON-CURRENT ASSETS SOLD DURING THE YEAR (Details) - Non-current assets held for sale
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Vessel
Dec. 31, 2015
USD ($)
Vessel
Disclosure Of Information About Non Current Assets Held For Sale [Line Items]    
Number of vessels sold 8  
Number of vessels delivered to new owner 4  
Number of vessels expected to be delivered in Q1 1  
Number of remaining vessels sold 3 2
Profit from sale of vessels | $ $ 2.8  
Impairment on sold or held-for-sale vessels | $ $ 3.6  
Amount in connection with wind-down of bulk activities | $   $ 18.0