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Earnings Per Share (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Vote
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Vote
$ / shares
shares
Jun. 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 $ 2,330 $ 1,970 $ 4,646 $ 3,982
Undistributed earnings 3,355 2,924 6,536 5,172
Basic 5,685 4,894 11,182 9,154
Class A Common earnings 500 480 989 889
Diluted $ 6,185 $ 5,374 $ 12,171 $ 10,043
Denominator [Abstract]        
Weighted average shares outstanding - basic (in shares) | shares 19,377 19,645 19,337 19,883
Assumed conversion of Class A Common Stock (in shares) | shares 1,801 2,027 1,807 2,029
Dilutive options, awards and common stock equivalents (in shares) | shares 418 317 424 331
Total weighted-average diluted Common Stock (in shares) | shares 21,596 21,989 21,568 22,243
Basic earnings per share:        
Common Stock (in dollars per share) | $ / shares $ 0.29 $ 0.25 $ 0.58 $ 0.46
Diluted earnings per share:        
Common Stock (in dollars per share) | $ / shares $ 0.29 $ 0.24 $ 0.56 $ 0.45
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 $ 203 $ 193 $ 407 $ 386
Undistributed earnings 297 287 582 503
Class A Common earnings $ 500 $ 480 $ 989 $ 889
Denominator [Abstract]        
Weighted average shares outstanding (in shares) | shares 1,801 2,027 1,807 2,029
Basic earnings per share:        
Common Stock (in dollars per share) | $ / shares $ 0.28 $ 0.24 $ 0.55 $ 0.44
Diluted earnings per share:        
Common Stock (in dollars per share) | $ / shares $ 0.27 $ 0.23 $ 0.54 $ 0.43