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STOCK BASED COMPENSATION - Stock Options (Details)
3 Months Ended 9 Months Ended
Jan. 05, 2017
$ / shares
shares
May 07, 2015
USD ($)
$ / shares
shares
May 06, 2015
item
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Mar. 31, 2017
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
2012 Equity Incentive Plan | Stock options                  
Stock-Based Compensation                  
Weighted Average Exercise Price | $ / shares $ 4.69                
Expiration period 7 years                
Stock-based compensation expense | $       $ 0   $ 0 $ 1,300,000 $ 0  
Fair value assumption                  
Expected volatility rate         49.48%        
Contractual option term         7 years        
Expected term         3 years 6 months        
Expected dividend rate         0.00%        
Risk-free interest rate         2.26%        
2012 Equity Incentive Plan | Stock options | $4.69                  
Exercise Price                  
Number Exercisable at the end of the period (in shares)       525,000     525,000    
Weighted Average Exercise Price (in dollars per share) | $ / shares       $ 4.69     $ 4.69    
Weighted-Average Remaining Contractual Life             6 years 3 months 18 days    
2012 Equity Incentive Plan | Mr. Georgiopoulos | Stock options                  
Stock-Based Compensation                  
Granted (in shares) 500,000                
2012 Equity Incentive Plan | Leonard J. Vrondissis | Stock options                  
Stock-Based Compensation                  
Granted (in shares) 25,000                
Navig8 Crude Tankers Inc | Stock options                  
Stock-Based Compensation                  
Multiplier for converting number of shares issuable under Nagiv8 plan   0.8947              
Denominator for converting exercise price of outstanding awards issued under Navig8 plan   0.8947              
Number of stock options modified | item     1            
Number of shares per option prior to modification     15,000            
Exercise Price | $ / shares   $ 15.088 $ 13.50            
Number of shares per option after modification   13,420              
2015 Acquired VLCC Newbuildings                  
Stock-Based Compensation                  
Fair value of stock option | $       $ 39,000     $ 39,000   $ 39,000
2015 Acquired VLCC Newbuildings | Navig8 Crude Tankers Inc | Stock options                  
Stock-Based Compensation                  
Fair value of stock option | $   $ 39,000