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STAFF COSTS - Additional Information (Details)
1 Months Ended 12 Months Ended
Jan. 01, 2019
EquityInstruments
Jan. 01, 2018
USD ($)
Jan. 01, 2017
EquityInstruments
Dec. 31, 2019
tranche
EquityInstruments
Nov. 30, 2019
EquityInstruments
Dec. 31, 2019
EquityInstruments
kr / shares
Dec. 31, 2019
USD ($)
EquityInstruments
Dec. 31, 2018
EquityInstruments
kr / shares
Dec. 31, 2018
USD ($)
EquityInstruments
Dec. 31, 2017
EquityInstruments
kr / shares
Dec. 31, 2017
USD ($)
EquityInstruments
Dec. 31, 2016
EquityInstruments
kr / shares
Disclosure Of Employee Benefits [Line Items]                        
Number of seafarers for which staff costs included in operating expenses | $             108   112   131  
Number of RSUs granted             1,001,100   944,468      
Long term incentive plan                        
Disclosure Of Employee Benefits [Line Items]                        
Number of RSUs granted             1,001,100   907,300   866,600  
Number of RSUs outstanding as of date       2,228,300   2,228,300 2,228,300 2,719,100 2,719,100 2,611,200 2,611,200 1,999,800
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Exercise price of RSUs | kr / shares           kr 53.7   kr 53.7        
Average remaining contractual life             1 year 6 months   1 year 1 month 6 days   1 year 3 months 18 days  
Key management personnel of entity or parent                        
Disclosure Of Employee Benefits [Line Items]                        
Aggregate compensation paid | $             $ 1,736,750   $ 2,186,679   $ 1,987,726  
Aggregate compensation paid for pensions | $             $ 115,880   125,959   $ 112,236  
Market value of one share | kr / shares                   kr 93.6    
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Vesting period of RSUs   3 years                    
Chief executive officer | Long term incentive plan                        
Disclosure Of Employee Benefits [Line Items]                        
Number of one fifth units vested in share-based payment arrangement. 255,345 255,345 255,345                  
Number of Tranches | tranche       2                
Number of RSUs granted                       1,276,725
Vesting percentage of RSU grant             100.00%          
Value of RSUs grant | $                 $ 900,000      
Market value of one share | kr / shares           49.5           kr 96.3
Percentage of non-vested RSU             60.00%          
Exercise price per share | kr / shares           kr 53.7            
Average strike price       90 days                
Percentage of premium on average price to determine exercise price       15.00%     15.00%          
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Exercise period of RSUs       360 days             3 years  
Chief executive officer | Long term incentive plan | Tranches One [Member]                        
Disclosure Of Employee Benefits [Line Items]                        
Number of RSUs granted       255,200                
Chief executive officer | Long term incentive plan | Tranches Two [Member]                        
Disclosure Of Employee Benefits [Line Items]                        
Number of RSUs granted       255,200                
Chief executive officer | Long term incentive plan | First Vesting over Three Years [Member]                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Vesting period of RSUs       3 years                
Chief executive officer | Long term incentive plan | Second Vesting over Three years [Member]                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Vesting period of RSUs       3 years                
Executive Director [Member] | Long term incentive plan                        
Disclosure Of Employee Benefits [Line Items]                        
Number of one fifth units vested in share-based payment arrangement.         255,345