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STOCK PLANS AND STOCK BASED COMPENSATION - DEFERRED COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Director      
Shares Deferred      
Outstanding, beginning of period (in shares) 99,227 86,800  
Deferred base salaries and dividend equivalents converted to stock units 17,811 18,241  
Stock units converted to Class A Common Shares (3,635) (5,814)  
Outstanding, end of period (in shares) 113,403 99,227 86,800
Vested (in shares) 113,403    
Weighted Average Market Price at Date of Deferral      
Outstanding, beginning of period (in dollars per share) $ 31.43 $ 29.98  
Deferred base salaries and dividend equivalents converted to stock units (in dollars per share) 43.14 46.58  
Stock units converted to Class A Common Shares (in dollars per share) 33.29 49.51  
Outstanding, end of period (in dollars per share) 35.65 $ 31.43 $ 29.98
Vested (in dollars per share) $ 35.65    
Weighted-Average Remaining Contractual Term (years)      
Deferred compensation expense $ 777 $ 503 $ 417
Director | Minimum      
Deferred Compensation      
Specified period during which board and committee fees may be deferred by participants 2 years    
Director | Maximum      
Deferred Compensation      
Specified period during which board and committee fees may be deferred by participants 5 years    
Key Employees      
Deferred Compensation      
Vesting period after Company match 5 years    
Shares Deferred      
Outstanding, beginning of period (in shares) 82,871 65,318  
Deferred base salaries and dividend equivalents converted to stock units 10,646 9,389  
Matching stock units credited (in shares) 10,578 9,315  
Matching stock units forfeited (in shares) (2,753) (1,151)  
Stock units converted to Class A Common Shares (5,084)    
Outstanding, end of period (in shares) 96,258 82,871 65,318
Vested (in shares) 59,626    
Unvested (in shares) 36,632    
Weighted Average Market Price at Date of Deferral      
Outstanding, beginning of period (in dollars per share) $ 41.03 $ 40.57  
Deferred base salaries and dividend equivalents converted to stock units (in dollars per share) 45.03 43.08  
Matching stock units credited (in dollars per share) 44.90 43.08  
Matching stock units forfeited (in dollar per share) 41.09 48.25  
Stock units converted to Class A Common Shares (in dollars per share) 43.01    
Outstanding, end of period (in dollars per share) 42.17 $ 41.03 $ 40.57
Vested (in dollars per share) 42.60    
Unvested (in dollars per share) $ 41.48    
Weighted-Average Remaining Contractual Term (years)      
Outstanding, end of period 2 years 10 months 2 days 3 years 1 month 17 days  
Vested (years) 3 years 1 month 9 days    
Unvested (years) 2 years 4 months 24 days    
Deferred compensation expense $ 484 $ 408 $ 429