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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
EARNINGS PER SHARE    
Net income $ 20,017 $ 17,735
Weighted average shares outstanding 20,915,000 20,904,000
Effect of dilutive securities (in shares) 81,000 105,000
Average shares outstanding including dilutive securities 20,996,000 21,009,000
Diluted earnings per share:    
Antidilutive stock options (in shares)   10,500
Average antidilutive stock options (in shares)   10,500
Class A Common Stock    
EARNINGS PER SHARE    
Cash dividend premium per share (as a percent) 10.00%  
Basic earnings per share:    
Basic earnings per share $ 0.97 $ 0.86
Diluted earnings per share:    
Diluted earnings per share 0.96 0.85
Class B Common Stock    
Basic earnings per share:    
Basic earnings per share 0.88 0.78
Diluted earnings per share:    
Diluted earnings per share $ 0.88 $ 0.77