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SUBSEQUENT EVENTS (Details) - USD ($)
shares in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2018
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2016
Subsequent Event [Line Items]            
Loss on termination     $ (2,379,000) $ (89,000) $ 0  
Senior unsecured facility $275.0 million [Member]            
Subsequent Event [Line Items]            
Principal amount           $ 275,000,000.0
Subsequent Event [Member] | Ship Finance International Limited [Member] | Front Circassia [Member]            
Subsequent Event [Line Items]            
Related party, Lease termination payments paid $ 8,900,000          
Capital lease obligations incurred 20,600,000          
Subsequent Event [Member] | Senior unsecured facility $275.0 million [Member]            
Subsequent Event [Line Items]            
Principal amount $ 275,000,000.0          
Loan facility extended period 12 months          
Scenario, Forecast [Member] | Subsequent Event [Member] | Ship Finance International Limited [Member] | Front Circassia [Member]            
Subsequent Event [Line Items]            
Loss on termination   $ 5,500,000        
DHT Holdings [Member]            
Subsequent Event [Line Items]            
available for sale securities, number of equity securities disposed     6.2      
Proceeds from Sale and Maturity of Marketable Securities     $ 27,400,000      
DHT Holdings [Member] | Subsequent Event [Member]            
Subsequent Event [Line Items]            
available for sale securities, number of equity securities disposed   4.7        
Proceeds from Sale and Maturity of Marketable Securities   $ 17,800,000