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CAPITAL STOCK AND STOCK COMPENSATION (Stock Option Activity) (Details) - $ / shares
12 Months Ended
Nov. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Expired (205,427)      
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Lower range, price (USD per share)   $ 3,350.00    
Upper range, price (USD per share)   4,000.00    
Forfeited price range, lower limit (Used Per share)   2,840.00    
Forfeited price range, upper limit (USD per share)   $ 2,840.00    
Common Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Granted     528,304  
Common Class A [Member] | Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Options Outstanding Beginning Balance   1,114,103 268,539 86,229
Granted   135,804   182,310
Forfeited   (140,345) (2,674)  
Expired   (737,669) (55,971)  
Exercised   0 0 0
INSW Spin off modification     581,332  
Cancellations related to INSW Spin-off     (205,427)  
Options Outstanding Ending Balance   371,893 1,114,103 268,539
Options Exercisable   99,272