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STOCK BASED COMPENSATION - Stock Options (Details)
3 Months Ended 6 Months Ended
Jan. 05, 2017
$ / shares
shares
May 07, 2015
USD ($)
$ / shares
shares
May 06, 2015
item
$ / shares
shares
Mar. 31, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 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 | $       $ 1,300,000 $ 0   $ 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    
Weighted Average Exercise Price (in dollars per share) | $ / shares           $ 4.69    
Weighted-Average Remaining Contractual Life           6 years 6 months    
2012 Equity Incentive Plan | Stock options | $15.09                
Exercise Price                
Number Exercisable at the end of the period (in shares)           13,000    
Weighted Average Exercise Price (in dollars per share) | $ / shares           $ 15.09    
Weighted-Average Remaining Contractual Life           1 month 6 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
2015 Acquired VLCC Newbuildings | Navig8 Crude Tankers Inc | Stock options                
Stock-Based Compensation                
Fair value of stock option | $   $ 39,000