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EQUITY COMPENSATION (Phantom Units) (Details) - Phantom units
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Units  
Balance at the beginning of the period (in units) | shares 266,138
Vested (in units) | shares (87,221.6)
Forfeited (in units) | shares (7,036)
Balance at the end of the period (in units) | shares 171,880
Weighted Average Grant Date Fair Value  
Balance at the beginning of the period (in dollars per unit) $ 19.00
Vested (in dollars per unit) 19.00
Forfeited (in dollars per unit) 19.00
Balance at the end of the period (in dollars per unit) 19.00
Share price (USD per share) $ 17.9
Unrecognized compensation expenses | $ $ 2.8
Weighted average period of compensation expense expected to be recognized 1 year 10 months 2 days
Cash used to settle awards | $ $ 1.7