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STOCK-BASED COMPENSATION - Narrative (Details) - Stock options
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 05, 2017
$ / shares
shares
Jun. 24, 2015
shares
May 07, 2015
$ / shares
shares
May 06, 2015
item
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
$ / shares
Navig8 Crude Tankers Inc                
Fair value assumptions                
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        
Number of shares per option after modification     13,420          
Exercise Price | $ / shares     $ 15.088 $ 13.50        
2012 Equity Incentive Plan                
Stock Options                
Options granted (in shares)         525,000      
Weighted Average Exercise Price | $ / shares $ 4.69       $ 4.69     $ 38.26
Expiration period 7 years              
Allocated Share-based Compensation Expense | $         $ 1.3 $ 0.0 $ 0.0  
Fair value assumptions                
Expected volatility rate         49.48%      
Contractual option term         7 years      
Expected option life         3 years 6 months      
Dividend yield as a percentage         0.00%      
Risk-free interest rate         2.26%      
Options forfeited (in shares)   343,662         344,000  
2012 Equity Incentive Plan | Mr. Georgiopoulos                
Stock Options                
Options granted (in shares) 500,000              
2012 Equity Incentive Plan | Leonard J. Vrondissis                
Stock Options                
Options granted (in shares) 25,000              
2012 Equity Incentive Plan | General and administrative expense                
Stock Options                
Allocated Share-based Compensation Expense | $         $ 0.0 $ 0.0 $ 1.2