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EQUITY COMPENSATION (Restricted Units Awards with a Market Condition) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2018
Jul. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Weighted Average Grant Date Fair Value        
Unrecognized compensation expenses     $ 90.5  
Restricted units with a market condition        
Equity compensation        
Weighted average grant date fair value (USD per share)     $ 9.30 $ 9.30
Fair Value        
Closing price of the Company's common shares 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 or shares)     1,333,334  
Granted (in units)   666,666 0  
Vested (in units)     0  
Forfeited (in units)     0  
Balance at the end of the period (in units or shares)     1,333,334 1,333,334
Weighted Average Grant Date Fair Value        
Weighted average grant date fair value (USD per share)     $ 9.30 $ 9.30
Granted (in dollars per share)     0  
Vested (in dollars per share)     0  
Forfeited (in dollars per share)     $ 0  
Unrecognized compensation expenses     $ 7.3  
Weighted average period of compensation expense expected to be recognized     2 years 2 months 12 days  
Restricted units with a market condition | Third Anniversary of Grant Date        
Equity compensation        
Weighted average price of shares purchased (USD per share) $ 35.00 $ 35.00    
Weighted average grant date fair value (USD per share) $ 10.92 10.92    
Vesting period 3 years      
Units        
Granted (in units) 666,667      
Weighted Average Grant Date Fair Value        
Weighted average grant date fair value (USD per share) $ 10.92 10.92    
Restricted units with a market condition | First Anniversary of Grant Date        
Equity compensation        
Weighted average price of shares purchased (USD per share) 45.00 45.00    
Weighted average grant date fair value (USD per share) $ 7.68 7.68    
Vesting period 4 years 3 months 18 days      
Units        
Granted (in units) 666,667      
Weighted Average Grant Date Fair Value        
Weighted average grant date fair value (USD per share) $ 7.68 $ 7.68