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Earnings Per Share (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
USD ($)
Vote
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Common Stock [Member]    
Earnings Per Share [Abstract]    
Percentage of earnings assumed to be distributed as dividends in earnings per share calculation 100.00%  
Preferential dividend rate 105.00%  
Number of votes per share | Vote 1  
Numerator [Abstract]    
Distributed earnings $ 3,964 $ 3,717
Undistributed earnings 14,008 14,262
Basic 17,972 17,979
Diluted $ 19,361 $ 19,406
Denominator [Abstract]    
Weighted average shares outstanding - basic (in shares) | shares 15,706 16,793
Assumed conversion of Class A Common Stock (in shares) | shares 1,287 1,431
Dilutive options, awards and common stock equivalents (in shares) | shares 520 507
Total weighted-average diluted Common Stock (in shares) | shares 17,513 18,731
Earnings Per Share [Abstract]    
Basic earnings per share (in dollars per share) | $ / shares $ 1.14 $ 1.07
Diluted earnings per share (in dollars per share) | $ / shares $ 1.11 $ 1.04
Class A Common Stock [Member]    
Earnings Per Share [Abstract]    
Number of votes per share | Vote 10  
Numerator [Abstract]    
Distributed earnings $ 296 $ 270
Undistributed earnings 1,093 1,157
Basic $ 1,389 $ 1,427
Denominator [Abstract]    
Weighted average shares outstanding (in shares) | shares 1,287 1,431
Earnings Per Share [Abstract]    
Basic earnings per share (in dollars per share) | $ / shares $ 1.08 $ 1.00
Diluted earnings per share (in dollars per share) | $ / shares $ 1.05 $ 0.98