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Earnings Per Share (Details)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Vote
shares
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2016
USD ($)
Vote
shares
Sep. 30, 2015
USD ($)
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 $ 2,290 $ 2,051 $ 6,273 $ 5,348
Undistributed earnings 4,405 4,935 9,581 11,633
Basic 6,695 6,986 15,854 16,981
Class A Common earnings 671 669 1,555 1,626
Diluted $ 7,366 $ 7,655 $ 17,409 $ 18,607
Denominator [Abstract]        
Weighted average shares outstanding - basic (in shares) | shares 19,083 20,448 19,615 20,538
Assumed conversion of Class A Common Stock (in shares) | shares 2,021 2,061 2,026 2,074
Dilutive options, awards and common stock equivalents (in shares) | shares 332 282 331 295
Total weighted-average diluted Common Stock (in shares) | shares 21,436 22,791 21,972 22,907
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 $ 227 $ 195 $ 612 $ 507
Undistributed earnings 444 474 943 1,119
Class A Common earnings $ 671 $ 669 $ 1,555 $ 1,626
Denominator [Abstract]        
Weighted average shares outstanding (in shares) | shares 2,021 2,061 2,026 2,074