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EQUITY-BASED COMPENSATION - Stock options (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Stock options    
Equity-based compensation    
Exercise of stock options 37,684  
Number of outstanding shares (in shares) 235,000 235,000
Number of exercisable shares (in shares) 235,000 235,000
Weighted average exercise price, outstanding (in dollars per share) | $ / shares $ 9.75 $ 9.75
Weighted average exercise price, exercisable (in dollars per share) | $ / shares $ 9.75 $ 9.75
Weighted Average Remaining Contractual Terms, outstanding   4 years 5 months
Weighted Average Remaining Contractual Terms, exercisable   4 years 5 months
Aggregate intrinsic value, outstanding | $ $ 0.8 $ 0.8
Aggregate intrinsic value, exercisable | $ $ 0.8 $ 0.8
Minimum    
Equity-based compensation    
Stock options term   5 years
Maximum    
Equity-based compensation    
Stock options term   10 years