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Earnings Per Share (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Percentage of earnings or losses assumed in calculation (in hundredths) 100.00%   100.00%  
Preferential dividend rate of dividend paid on Class A Common Stock (in hundredths) 105.00%   105.00%  
Denominator [Abstract]        
Antidilutive shares excluded from the denominator due to the options exercise prices being greater than the average market price 0 291 0 292
Common Stock [Member]
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Number of votes per share 1   1  
Numerator [Abstract]        
Distributed earnings $ 1,603 $ 766 $ 3,180 $ 1,528
Undistributed earnings 6,901 2,134 16,900 5,552
Basic 8,504 2,900 20,080 7,080
Class A Common earnings (loss) 990 414 2,504 1,052
Diluted 9,494 3,314 22,584 8,132
Denominator [Abstract]        
Weighted average shares outstanding - basic (in shares) 20,047 19,163 19,786 19,018
Assumed conversion of Class A Common Stock (in shares) 2,455 2,887 2,606 2,986
Dilutive options, awards and common stock equivalents (in shares) 353 321 391 315
Total weighted-average diluted Common Stock (in shares) 22,855 22,371 22,783 22,319
Class A Common [Member]
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Number of votes per share 10   10  
Numerator [Abstract]        
Distributed earnings 185 108 384 222
Undistributed earnings 805 306 2,120 830
Class A Common earnings (loss) $ 990 $ 414 $ 2,504 $ 1,052
Denominator [Abstract]        
Weighted average shares outstanding - basic (in shares) 2,455 2,887 2,606 2,986
Total weighted-average diluted Common Stock (in shares) 2,455 2,887 2,606 2,986
Weighted average shares outstanding (in shares) 2,455 2,887 2,606 2,986