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BASIS OF PREPARATION AND ACCOUNTING POLICIES - Property and Equipment (Details)
12 Months Ended
Dec. 31, 2017
Vessels  
Property and equipment:  
Useful lives applied in depreciation 40 years
Deferred drydocking expenditure  
Property and equipment:  
Useful lives applied in depreciation 5 years
Minimum | Office equipment and fittings  
Property and equipment:  
Useful lives applied in depreciation 3 years
Maximum | Office equipment and fittings  
Property and equipment:  
Useful lives applied in depreciation 6 years