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Earnings Per Share (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Vote
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
Vote
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
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, Basic, by Common Class, Including Two Class Method [Line Items]        
Number of votes per share | Vote 1   1  
Numerator [Abstract]        
Distributed earnings $ 2,913 $ 2,290 $ 7,560 $ 6,273
Undistributed earnings 2,586 4,405 9,122 9,581
Basic 5,499 6,695 16,682 15,854
Class A Common earnings 484 671 1,472 1,555
Diluted $ 5,983 $ 7,366 $ 18,154 $ 17,409
Denominator [Abstract]        
Weighted average shares outstanding - basic (in shares) | shares 19,421 19,083 19,365 19,615
Assumed conversion of Class A Common Stock (in shares) | shares 1,798 2,021 1,804 2,026
Dilutive options, awards and common stock equivalents (in shares) | shares 391 332 413 331
Total weighted-average diluted Common Stock (in shares) | shares 21,610 21,436 21,582 21,972
Basic earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.28 $ 0.35 $ 0.86 $ 0.81
Diluted earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.28 $ 0.34 $ 0.84 $ 0.79
Class A Common [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Number of votes per share | Vote 10   10  
Numerator [Abstract]        
Distributed earnings $ 256 $ 227 $ 663 $ 612
Undistributed earnings 228 444 809 943
Class A Common earnings $ 484 $ 671 $ 1,472 $ 1,555
Denominator [Abstract]        
Weighted average shares outstanding (in shares) | shares 1,798 2,021 1,804 2,026
Basic earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.27 $ 0.33 $ 0.82 $ 0.77
Diluted earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.27 $ 0.33 $ 0.81 $ 0.76