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EQUITY COMPENSATION (Phantom Units) (Details) - Phantom units
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Equity compensation  
Number of trading days immediately prior to vesting dates 15 days
Number of trading days immediately following to vesting dates 15 days
Vesting period 5 years
Units  
Balance at the beginning of the period (in units) | shares 266,138
Vested (in units) | shares (87,222)
Forfeited (in units) | shares (22,763)
Balance at the end of the period (in units) | shares 156,153
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) $ 20.00
Unrecognized compensation expenses | $ $ 2.1
Weighted average period of compensation expense expected to be recognized 1 year 3 months 29 days
Cash paid to settle awards | $ $ 1.7