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Earnings Per Share (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
Vote
$ / shares
shares
Mar. 31, 2017
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%  
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  
Numerator [Abstract]    
Distributed earnings $ 3,491 $ 2,317
Undistributed earnings 2,320 3,180
Basic 5,811 5,497
Class A Common earnings 502 489
Diluted $ 6,313 $ 5,986
Denominator [Abstract]    
Weighted average shares outstanding - basic (in shares) | shares 19,418 19,297
Assumed conversion of Class A Common Stock (in shares) | shares 1,767 1,813
Dilutive options, awards and common stock equivalents (in shares) | shares 420 430
Total weighted-average diluted Common Stock (in shares) | shares 21,605 21,540
Basic earnings per share [Abstract]    
Common Stock (in dollars per share) | $ / shares $ 0.30 $ 0.28
Diluted earnings per share [Abstract]    
Common Stock (in dollars per share) | $ / shares $ 0.29 $ 0.28
Class A Common [Member]    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Number of votes per share | Vote 10  
Numerator [Abstract]    
Distributed earnings $ 301 $ 204
Undistributed earnings 201 285
Class A Common earnings $ 502 $ 489
Denominator [Abstract]    
Weighted average shares outstanding (in shares) | shares 1,767 1,813
Basic earnings per share [Abstract]    
Common Stock (in dollars per share) | $ / shares $ 0.28 $ 0.27
Diluted earnings per share [Abstract]    
Common Stock (in dollars per share) | $ / shares $ 0.28 $ 0.27