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DISCONTINUED OPERATIONS (Narrative) (Details)
$ in Thousands
3 Months Ended 11 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
item
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Nov. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Transition services agreement, termination period           30 days    
Stockholders' equity, spinoff transaction             $ 895,650  
Indirect costs allocated to INSW             15,380 $ 29,969
Reorganization Items, net             131 5,659
Spin-off related costs         $ 12,264      
Net (Loss)/Income from Discontinued Operations $ (340,153) $ (45,884) $ 34,045 $ 59,437   $ 0 $ (292,555) $ 203,395
INSW's International Flag Fleet [Member]                
Percentag eOf Decline In Vessel Valuation   20.00%            
Number Of Vessels Decline In Valuation | item   28            
Asset Impairment Charges   $ 49,640            
Asset Impairment Charges Fair Value   $ 68,875            
Number Of Vessels Same Valuation | item   24            
Discontinued Operations of Two Joint Ventures [Member]                
Approximate ownership interest in two joint ventures           50.00%    
Asset Impairment Charges $ 332,562              
Fair Value Inputs, Discount Rate           9.00%    
Equity method investment, ownership percentage           50.00%    
Minimum [Member]                
Weighted average cost of capital, percentage           8.70%    
Maximum [Member]                
Weighted average cost of capital, percentage           9.50%