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IMPAIRMENT TESTING (Details textuals 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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 $ 18,003 $ 17,216 $ 20,176
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 16,907 16,445 17,124
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 15,349 15,794 15,118
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 $ 13,968 $ 14,416 $ 15,203