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EQUITY COMPENSATION - RSUs (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
RSU With Performance Measures      
Nonvested Restricted Share Units      
Beginning balance (in shares) 546,898    
Granted (in shares) 231,069    
Vested (in shares) (108,041)   0
Forfeited (in shares) (6,199)    
Ending balance (in shares) 663,727 546,898  
Grant Date Fair Value*      
Weighted average beginning balance (in dollars per share) $ 63.57    
Weighted average granted (in dollars per share) 59.77 $ 57.95 $ 57.21
Weighted average, vested (in dollars per share) 87.98    
Weighted average, forfeited (in dollars per share) 58.44    
Weighted average ending balance (in dollars per share) $ 58.32 $ 63.57  
Remaining weighted-average contractual term (in years) 1 year 2 months 12 days    
Total unrecognized compensation expense, $ 11.4    
Total fair value of shares $ 7.9 $ 5.5  
RSUs      
Nonvested Restricted Share Units      
Beginning balance (in shares) 239,495    
Granted (in shares) 79,199    
Vested (in shares) (52,412)    
Forfeited (in shares) (2,068)    
Ending balance (in shares) 264,214 239,495  
Grant Date Fair Value*      
Weighted average beginning balance (in dollars per share) $ 58.98    
Weighted average granted (in dollars per share) 57.47 $ 60.93 $ 55.30
Weighted average, vested (in dollars per share) 62.92    
Weighted average, forfeited (in dollars per share) 57.35    
Weighted average ending balance (in dollars per share) $ 57.76 $ 58.98  
Remaining weighted-average contractual term (in years) 1 year 1 month 6 days    
Total unrecognized compensation expense, $ 4.5    
Total fair value of shares $ 3.3 $ 4.7 $ 2.4