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SHARE-BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Additional Disclosures [Abstract]    
Vested share-based awards withheld to satisfy income tax obligations (in shares) 37,640 38,811
Vested share-based awards withheld to satisfy income tax obligations $ 2.7 $ 2.8
Restricted Stock [Member]    
Number of Shares [Roll Forward]    
Nonvested at beginning of period (in shares) 193,580  
Granted (in shares) 90,589  
Vested (in shares) (104,071)  
Forfeited (in shares) 0  
Nonvested at end of period (in shares) 180,098  
Weighted Average Grant-date Fair Value [Roll Forward]    
Nonvested at beginning of period (in dollars per share) $ 73.74  
Granted (in dollars per share) 71.80  
Vested (in dollars per share) 69.19  
Forfeited (in dollars per share) 0  
Nonvested at end of period (in dollars per share) $ 75.39  
2017 Director LTIP [Member] | Restricted Stock [Member]    
Number of Shares [Roll Forward]    
Granted (in shares) 716 454
2012 Employee LTIP [Member] | Restricted Stock [Member]    
Number of Shares [Roll Forward]    
Granted (in shares) 89,873 85,132
Additional Disclosures [Abstract]    
Vested share-based awards withheld to satisfy income tax obligations (in shares) 37,640  
Vested share-based awards withheld to satisfy income tax obligations $ 2.7