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Earnings Per Share (Details)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
Vote
shares
Mar. 31, 2015
USD ($)
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 $ 2,012 $ 1,646
Undistributed earnings 2,248 3,938
Basic 4,260 5,584
Class A Common earnings 409 535
Diluted $ 4,669 $ 6,119
Denominator [Abstract]    
Weighted average shares outstanding - basic (in shares) | shares 20,121 20,569
Assumed conversion of Class A Common Stock (in shares) | shares 2,031 2,081
Dilutive options, awards and common stock equivalents (in shares) | shares 344 327
Total weighted-average diluted Common Stock (in shares) | shares 22,496 22,977
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 $ 193 $ 156
Undistributed earnings 216 379
Class A Common earnings $ 409 $ 535
Denominator [Abstract]    
Weighted average shares outstanding (in shares) | shares 2,031 2,081