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Earnings Per Share (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Vote
Jun. 30, 2012
Jun. 30, 2013
Vote
Jun. 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%  
Number of votes per share 1   1  
Denominator [Abstract]        
Antidilutive shares excluded from the denominator due to the options exercise prices being greater than the average market price 0 292 0 292
Common Stock [Member]
        
Numerator [Abstract]        
Distributed earnings $ 797 $ 762 $ 1,577 $ 762
Undistributed earnings 3,497 1,293 10,013 3,421
Basic 4,294 2,055 11,590 4,183
Class A Common earnings (loss) 536 306 1,500 635
Diluted 4,830 2,361 13,090 4,818
Denominator [Abstract]        
Weighted average shares outstanding - basic (in shares) 19,807 19,023 19,654 18,944
Assumed conversion of Class A Common Stock (in shares) 2,614 2,989 2,682 3,037
Dilutive options, awards and common stock equivalents (in shares) 370 301 418 311
Total weighted-average diluted Common Stock (in shares) 22,791 22,313 22,754 22,292
Class A Common [Member]
        
Numerator [Abstract]        
Distributed earnings 96 113 199 113
Undistributed earnings 440 193 1,301 522
Class A Common earnings (loss) $ 536 $ 306 $ 1,500 $ 635
Denominator [Abstract]        
Weighted average shares outstanding - basic (in shares) 2,614 2,989 2,682 3,037
Total weighted-average diluted Common Stock (in shares) 2,614 2,989 2,682 3,037
Weighted average shares outstanding (in shares) 2,614 2,989 2,682 3,037