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Earnings Per Share (Details)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
Vote
shares
Mar. 31, 2016
USD ($)
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 $ 2,317 $ 2,012
Undistributed earnings 3,180 2,248
Basic 5,497 4,260
Class A Common earnings 489 409
Diluted $ 5,986 $ 4,669
Denominator [Abstract]    
Weighted average shares outstanding - basic (in shares) | shares 19,297 20,121
Assumed conversion of Class A Common Stock (in shares) | shares 1,813 2,031
Dilutive options, awards and common stock equivalents (in shares) | shares 430 344
Total weighted-average diluted Common Stock (in shares) | shares 21,540 22,496
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 $ 204 $ 193
Undistributed earnings 285 216
Class A Common earnings $ 489 $ 409
Denominator [Abstract]    
Weighted average shares outstanding (in shares) | shares 1,813 2,031