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SHARE BASED COMPENSATION - Activity for Restricted Shares Awards and Restricted Stock Units (Details) - $ / shares
8 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 30, 2018
Shares [Roll Forward]          
Award vesting period   4 years      
Restricted Share Awards | Restricted Stock          
Shares [Roll Forward]          
Unvested, beginning of period (in shares) 9,900 2,192 7,191   19,511
Granted (in shares) 0 0 0   9,136
Vested (in shares) (2,709) (2,192) (4,999)   (18,545)
Forfeited (in shares) 0 0 0   (202)
Unvested, end of period (in shares) 7,191 0 2,192 7,191 9,900
Wtd Avg Grant-Date Fair Value [Abstract]          
Unvested, beginning of period (in dollars per share) $ 59.20  
Granted (in dollars per share)     57.55
Vested (in dollars per share) 63.21 $ 59.20 61.06   59.89
Forfeited (in dollars per share)         62.40
Unvested, end of period (in dollars per share)   $ 59.20
Restricted Share Awards | Restricted Stock | LTIP Awards          
Shares [Roll Forward]          
Granted (in shares)   9,709      
Award vesting period   3 years      
Restricted Stock Units with Service Conditions | Restricted Stock Units (RSU)          
Shares [Roll Forward]          
Unvested, beginning of period (in shares) 6,787 22,346 18,260   0
Granted (in shares) 14,878   17,981 16,084 6,994
Vested (in shares) (2,943)   (14,991) (11,633) (207)
Change in awards (in shares)     0    
Forfeited (in shares) (462)   (508) (365) 0
Unvested, end of period (in shares) 18,260 24,828 22,346 18,260 6,787
Wtd Avg Grant-Date Fair Value [Abstract]          
Unvested, beginning of period (in dollars per share) $ 60.85 $ 58.41 $ 55.13   $ 0
Granted (in dollars per share) 53.60   68.25 $ 59.76 60.54
Vested (in dollars per share) 60.83   59.10 55.35 50.30
Change in awards (in dollars per share)     0    
Forfeited (in dollars per share) 53.60   62.99 51.73 0
Unvested, end of period (in dollars per share) $ 55.13 $ 65.03 $ 58.41 $ 55.13 $ 60.85
Restricted Stock With Market Conditions | Restricted Stock Units (RSU)          
Shares [Roll Forward]          
Unvested, beginning of period (in shares) 11,538 37,822 25,319   0
Granted (in shares) 15,461   0 12,978 11,538
Vested (in shares) 0   (13,357) 0 0
Change in awards (in shares)     4,436    
Forfeited (in shares) (1,680)   (1,907) (475) 0
Unvested, end of period (in shares) 25,319 26,994 37,822 25,319 11,538
Wtd Avg Grant-Date Fair Value [Abstract]          
Unvested, beginning of period (in dollars per share) $ 70.90 $ 68.62 $ 62.84   $ 0
Granted (in dollars per share) 57.70   0 $ 79.49 70.90
Vested (in dollars per share) 0   74.68 0 0
Change in awards (in dollars per share)     0    
Forfeited (in dollars per share) 70.90   63.92 57.70 0
Unvested, end of period (in dollars per share) $ 62.84 $ 67.87 $ 68.62 $ 62.84 $ 70.90