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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
EARNINGS PER SHARE    
Net Income (Loss) $ 30,606 $ 28,092
Dividends declared on Common Stock:    
Undistributed net income for basic earnings per share 22,824 20,777
Weighted average potential dividends on Class A shares upon exercise of dilutive options (36) (21)
Undistributed net income for diluted earnings per share $ 22,788 $ 20,756
Weighted average shares outstanding:    
Effect of dilutive securities on Class A Shares outstanding 87,000 55,000
Weighted average shares outstanding including dilutive securities 19,694,000 19,990,000
Employee Stock Option [Member]    
Diluted earnings per share:    
Antidilutive stock options (in shares) 52,781 245,898
Employee Stock Option [Member] | Weighted Average    
Diluted earnings per share:    
Antidilutive stock options (in shares) 52,781 245,898
Class A Common Stock    
EARNINGS PER SHARE    
Cash dividend premium per share (as a percent) 10.00%  
Dividends declared on Common Stock:    
Dividends declared on Common Stock $ (6,986) $ (6,581)
Weighted average shares outstanding:    
Weighted average shares outstanding 17,456,000 17,776,000
Basic earnings per share:    
Per share dividends distributed $ 0.41 $ 0.37
Undistributed earnings per share 1.18 1.05
Total basic earnings per share 1.59 1.42
Diluted earnings per share:    
Per share dividends distributed 0.41 0.37
Undistributed earnings per share 1.17 1.05
Total diluted earnings per share $ 1.58 $ 1.42
Class B Common Stock    
Dividends declared on Common Stock:    
Dividends declared on Common Stock $ (796) $ (734)
Weighted average shares outstanding:    
Weighted average shares outstanding 2,151,000 2,159,000
Basic earnings per share:    
Per share dividends distributed $ 0.37 $ 0.34
Undistributed earnings per share 1.07 0.96
Total basic earnings per share 1.44 1.30
Diluted earnings per share:    
Per share dividends distributed 0.37 0.34
Undistributed earnings per share 1.06 0.95
Total diluted earnings per share $ 1.43 $ 1.29