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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
1 Months Ended 9 Months Ended
Jul. 31, 2018
Jul. 31, 2018
Sep. 30, 2018
Sep. 30, 2018
Jul. 31, 2018
Equity compensation          
Grant date fair value (USD per share)     $ 0.00 $ 9.30  
Valuation assumptions          
Closing price of the Company common share as of valuation date (USD per share)       $ 20.95  
Risk-free interest rate     2.95%    
Volatility     30.00%    
Dividend yield     5.00%    
Cost of equity     10.00%    
Units          
Balance at the beginning of the period (in units)     0    
Granted (in units)   666,666 1,333,334    
Vested (in units)     0    
Forfeited (in units)     0    
Balance at the end of the period (in units)     1,333,334    
Weighted Average Grant Date Fair Value          
Balance at the beginning of the period (in dollars per share)     $ 0.00    
Granted (in dollars per share)     9.30    
Vested (in dollars per share)     0.00    
Forfeited (in dollars per share)     0.00    
Balance at the end of the period (in dollars per share)     $ 9.30    
Unrecognized compensation expenses       $ 11.8  
Weighted average period of compensation expense expected to be recognized     3 years 4 months 17 days    
Tranche I          
Equity compensation          
Weighted average closing price (USD per hare)         $ 35.00
Grant date fair value (USD per share) $ 10.92 $ 10.92     10.92
Valuation assumptions          
Vesting period 3 years        
Units          
Granted (in units) 666,667        
Weighted Average Grant Date Fair Value          
Balance at the end of the period (in dollars per share) $ 10.92 10.92      
Tranche II          
Equity compensation          
Weighted average closing price (USD per hare)         45.00
Grant date fair value (USD per share) $ 7.68 7.68     $ 7.68
Valuation assumptions          
Vesting period 4 years 3 months 18 days        
Units          
Granted (in units) 666,667        
Weighted Average Grant Date Fair Value          
Balance at the end of the period (in dollars per share) $ 7.68 $ 7.68