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Earnings Per Share (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
Vote
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
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%  
Class A Common Stock [Member]    
Earnings Per Share [Abstract]    
Number of votes per share | Vote 10  
Numerator [Abstract]    
Distributed earnings $ 270 $ 291
Undistributed earnings 1,157 (149)
Basic $ 1,427 $ 142
Denominator [Abstract]    
Weighted average shares outstanding (in shares) | shares 1,431 1,532
Earnings Per Share [Abstract]    
Basic earnings per share (in dollars per share) | $ / shares $ 1.00 $ 0.09
Diluted earnings per share (in dollars per share) | $ / shares $ 0.98 $ 0.09
Common Stock [Member]    
Earnings Per Share [Abstract]    
Number of votes per share | Vote 1  
Numerator [Abstract]    
Distributed earnings $ 3,717 $ 3,459
Undistributed earnings 14,262 (1,782)
Basic 17,979 1,677
Diluted $ 19,406 $ 1,819
Denominator [Abstract]    
Weighted average shares outstanding - basic (in shares) | shares 16,793 17,460
Assumed conversion of Class A Common Stock (in shares) | shares 1,431 1,532
Dilutive options, awards and common stock equivalents (in shares) | shares 507 274
Total weighted-average diluted Common Stock (in shares) | shares 18,731 19,266
Earnings Per Share [Abstract]    
Basic earnings per share (in dollars per share) | $ / shares $ 1.07 $ 0.10
Diluted earnings per share (in dollars per share) | $ / shares $ 1.04 $ 0.09