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Earnings Per Share (Details)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Vote
shares
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2016
USD ($)
Vote
shares
Jun. 30, 2015
USD ($)
shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Percentage of earnings or losses assumed in calculation 100.00%   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 $ 1,970 $ 1,651 $ 3,982 $ 3,297
Undistributed earnings 2,924 2,761 5,172 6,698
Basic 4,894 4,412 9,154 9,995
Class A Common earnings 480 421 889 957
Diluted $ 5,374 $ 4,833 $ 10,043 $ 10,952
Denominator [Abstract]        
Weighted average shares outstanding - basic (in shares) | shares 19,645 20,600 19,883 20,585
Assumed conversion of Class A Common Stock (in shares) | shares 2,027 2,079 2,029 2,080
Dilutive options, awards and common stock equivalents (in shares) | shares 317 276 331 302
Total weighted-average diluted Common Stock (in shares) | shares 21,989 22,955 22,243 22,967
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 $ 193 $ 156 $ 386 $ 312
Undistributed earnings 287 265 503 645
Class A Common earnings $ 480 $ 421 $ 889 $ 957
Denominator [Abstract]        
Weighted average shares outstanding (in shares) | shares 2,027 2,079 2,029 2,080