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EQUITY COMPENSATION (Restricted Units Awards with a Market Condition) (Details) - Restricted units with a market condition - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Units    
Balance at the beginning of the period (in units or shares) 1,333,334  
Granted (in units) 0  
Vested (in units) (666,667)  
Forfeited (in units) 0  
Balance at the end of the period (in units or shares) 666,667  
Weighted Average Grant Date Fair Value    
Weighted average grant date fair value (USD per share) $ 7.68 $ 9.30
Granted (in dollars per share) 0  
Vested (in dollars per share) 10.92  
Forfeited (in dollars per share) $ 0  
Share-based compensation expense $ 3.7  
Unrecognized compensation expenses $ 2.8  
Weighted average period of compensation expense expected to be recognized 2 years 4 months 24 days