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ACQUISITIONS (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 10, 2013
USD ($)
$ / shares
shares
Jan. 02, 2013
USD ($)
Dec. 31, 2012
Tanker
Dec. 31, 2015
USD ($)
Dec. 31, 2013
USD ($)
Business Acquisition [Line Items]          
Goodwill recognized       $ 18,979  
Settlement loss       $ 0 $ 5,000
Scandic American Shipping Ltd [Member]          
Business Acquisition [Line Items]          
Purchase price $ 33,300        
Common shares paid 18,100        
Cash consideration 8,000        
Payable to seller $ 7,200        
Number of shares transferred in acquisition (in shares) | shares 1,910,112        
Share price of stock transferred (in dollars per share) | $ / shares $ 9.50        
Goodwill recognized $ 19,000        
Settlement loss $ 5,000        
Orion Tankers Ltd [Member]          
Business Acquisition [Line Items]          
Cash consideration   $ 300      
Number of tankers withdrawn from pool | Tanker     9    
Percentage of entity acquired   50.00%      
Total assets acquired   $ 1,800      
Total liabilities assumed   $ 1,300