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Earnings Per Share (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Vote
$ / shares
shares
Sep. 30, 2019
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 $ 290 $ 292 $ 796 $ 852
Undistributed earnings 1,140 163 1,825 355
Basic $ 1,430 $ 455 $ 2,621 $ 1,207
Denominator [Abstract]        
Weighted average shares outstanding (in shares) | shares 1,526 1,536 1,530 1,637
Earnings Per Share [Abstract]        
Basic earnings per share (in dollars per share) | $ / shares $ 0.94 $ 0.30 $ 1.71 $ 0.74
Diluted earnings per share (in dollars per share) | $ / shares $ 0.93 $ 0.30 $ 1.70 $ 0.73
Common Stock [Member]        
Earnings Per Share [Abstract]        
Number of votes per share | Vote     1  
Numerator [Abstract]        
Distributed earnings $ 3,423 $ 3,617 $ 9,475 $ 10,342
Undistributed earnings 13,408 2,025 21,624 4,216
Basic 16,831 5,642 31,099 14,558
Diluted $ 18,261 $ 6,097 $ 33,720 $ 15,765
Denominator [Abstract]        
Weighted average shares outstanding - basic (in shares) | shares 17,098 18,116 17,267 18,514
Assumed conversion of Class A Common Stock (in shares) | shares 1,526 1,536 1,530 1,637
Dilutive options, awards and common stock equivalents (in shares) | shares 240 241 241 293
Total weighted-average diluted Common Stock (in shares) | shares 18,864 19,893 19,038 20,444
Earnings Per Share [Abstract]        
Basic earnings per share (in dollars per share) | $ / shares $ 0.98 $ 0.31 $ 1.80 $ 0.79
Diluted earnings per share (in dollars per share) | $ / shares $ 0.97 $ 0.31 $ 1.77 $ 0.77