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Earnings Per Share (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Vote
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
Vote
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Earnings Per Share, by Common Class Method [Abstract]        
Percentage of earnings or losses assumed in calculation 100.00%   100.00%  
Basic earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.31 $ 0.40 $ 0.79 $ 1.00
Diluted earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.31 $ 0.39 $ 0.77 $ 0.98
Common Stock [Member]        
Earnings Per Share, by Common Class Method [Abstract]        
Number of votes per share | Vote 1   1  
Numerator [Abstract]        
Distributed earnings $ 3,617 $ 3,451 $ 10,342 $ 10,436
Undistributed earnings 2,025 4,230 4,216 8,777
Basic 5,642 7,681 14,558 19,213
Class A Common earnings 455 671 1,207 1,666
Diluted $ 6,097 $ 8,352 $ 15,765 $ 20,879
Denominator [Abstract]        
Weighted average shares outstanding - basic (in shares) | shares 18,116 19,138 18,514 19,288
Assumed conversion of Class A Common Stock (in shares) | shares 1,536 1,765 1,637 1,766
Dilutive options, awards and common stock equivalents (in shares) | shares 241 327 293 354
Total weighted-average diluted Common Stock (in shares) | shares 19,893 21,230 20,444 21,408
Basic earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.31 $ 0.40 $ 0.79 $ 1.00
Diluted earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.31 $ 0.39 $ 0.77 $ 0.98
Class A Common [Member]        
Earnings Per Share, by Common Class Method [Abstract]        
Preferential dividend rate of dividend paid     105.00%  
Number of votes per share | Vote 10   10  
Numerator [Abstract]        
Distributed earnings $ 292 $ 300 $ 852 $ 901
Undistributed earnings 163 371 355 765
Class A Common earnings $ 455 $ 671 $ 1,207 $ 1,666
Denominator [Abstract]        
Weighted average shares outstanding (in shares) | shares 1,536 1,765 1,637 1,766
Basic earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.30 $ 0.38 $ 0.74 $ 0.94
Diluted earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.30 $ 0.38 $ 0.73 $ 0.94