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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
EARNINGS PER SHARE    
Net income $ 26,697 $ 29,516
Dividends declared on Common Stock:    
Undistributed net income for basic earnings per share 20,767 24,052
Weighted average potential dividends on Class A shares upon exercise of dilutive options (17) (35)
Undistributed net income for diluted earnings per share $ 20,750 $ 24,017
Weighted average shares outstanding:    
Effect of dilutive securities on Class A Shares outstanding 59,000 133,000
Weighted average shares outstanding including dilutive securities 21,094,000 21,106,000
Stock option    
Diluted earnings per share:    
Antidilutive stock options (in shares) 175,000 163,000
Stock option | Weighted Average    
Diluted earnings per share:    
Antidilutive stock options (in shares) 159,000 162,000
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 $ (5,358) $ (4,933)
Weighted average shares outstanding:    
Weighted average shares outstanding 18,831,000 18,761,000
Basic earnings per share:    
Per share dividends distributed $ 0.29 $ 0.26
Undistributed earnings per share 1.00 1.16
Total basic earnings per share 1.29 1.42
Diluted earnings per share:    
Per share dividends distributed 0.29 0.26
Undistributed earnings per share 0.99 1.15
Total diluted earnings per share $ 1.28 $ 1.41
Class B Common Stock    
Dividends declared on Common Stock:    
Dividends declared on Common Stock $ (572) $ (531)
Weighted average shares outstanding:    
Weighted average shares outstanding 2,204,000 2,212,000
Basic earnings per share:    
Per share dividends distributed $ 0.26 $ 0.24
Undistributed earnings per share 0.91 1.05
Total basic earnings per share 1.17 1.29
Diluted earnings per share:    
Per share dividends distributed 0.26 0.24
Undistributed earnings per share 0.90 1.04
Total diluted earnings per share $ 1.16 $ 1.28