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IMPAIRMENT TESTING - Historical average spot freight rates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Historical average spot freight rates 10-year    
LR2      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Amended historical average spot rate used in per day freight rate calculation $ 17,986 $ 18,003 $ 17,216
LR1      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Amended historical average spot rate used in per day freight rate calculation 17,060 16,907 16,445
MR      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Amended historical average spot rate used in per day freight rate calculation 15,802 15,349 15,794
Handysize      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Amended historical average spot rate used in per day freight rate calculation $ 13,601 $ 13,968 $ 14,416