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EQUITY COMPENSATION (Phantom Shares) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Weighted Average Grant Date Fair Value  
Unrecognized compensation expenses | $ $ 90.5
Phantom Shares  
Units  
Balance at the beginning of the period (in units or shares) | shares 66,287
Vested (in units) | shares (61,502)
Forfeited (in units) | shares (4,785)
Balance at the end of the period (in units or shares) | shares 0
Weighted Average Grant Date Fair Value  
Balance at the beginning of the period (in dollars per share) | $ / shares $ 19.00
Vested (in dollars per share) | $ / shares 19.00
Forfeited (in dollars per share) | $ / shares 19.00
Balance at the end of the period (in dollars per share) | $ / shares $ 0
Number of trading days 15 days
Vesting period 5 years
Settle vested phantom shares | $ $ 1.5