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Earnings Per Share (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Vote
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
Vote
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Earnings Per Share, by Common Class Method [Abstract]        
Percentage of earnings or losses assumed in calculation 100.00%   100.00%  
Preferential dividend rate of dividend paid on Class A Common Stock     105.00%  
Common Stock [Member]        
Earnings Per Share, by Common Class Method [Abstract]        
Number of votes per share | Vote 1   1  
Numerator [Abstract]        
Distributed earnings $ 3,451 $ 2,913 $ 10,436 $ 7,560
Undistributed earnings 4,230 2,586 8,777 9,122
Basic 7,681 5,499 19,213 16,682
Class A Common earnings 671 484 1,666 1,472
Diluted $ 8,352 $ 5,983 $ 20,879 $ 18,154
Denominator [Abstract]        
Weighted average shares outstanding - basic (in shares) | shares 19,138 19,421 19,288 19,365
Assumed conversion of Class A Common Stock (in shares) | shares 1,765 1,798 1,766 1,804
Dilutive options, awards and common stock equivalents (in shares) | shares 327 391 354 413
Total weighted-average diluted Common Stock (in shares) | shares 21,230 21,610 21,408 21,582
Basic earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.40 $ 0.28 $ 1.00 $ 0.86
Diluted earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.39 $ 0.28 $ 0.98 $ 0.84
Class A Common [Member]        
Earnings Per Share, by Common Class Method [Abstract]        
Number of votes per share | Vote 10   10  
Numerator [Abstract]        
Distributed earnings $ 300 $ 256 $ 901 $ 663
Undistributed earnings 371 228 765 809
Class A Common earnings $ 671 $ 484 $ 1,666 $ 1,472
Denominator [Abstract]        
Weighted average shares outstanding (in shares) | shares 1,765 1,798 1,766 1,804
Basic earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.38 $ 0.27 $ 0.94 $ 0.82
Diluted earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.38 $ 0.27 $ 0.94 $ 0.81