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Earnings Per Share (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Vote
Mar. 31, 2013
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%  
Preferential dividend rate of dividend paid on Class A Common Stock (in hundredths) 105.00%  
Common Stock [Member]
    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Number of votes per share 1  
Numerator [Abstract]    
Distributed earnings $ 1,610 $ 780
Undistributed earnings 3,905 6,503
Basic 5,515 7,283
Class A Common earnings (loss) 614 977
Diluted 6,129 8,260
Denominator [Abstract]    
Weighted average shares outstanding - basic (in shares) 20,157 19,717
Assumed conversion of Class A Common Stock (in shares) 2,358 2,781
Dilutive options, awards and common stock equivalents (in shares) 413 457
Total weighted-average diluted Common Stock (in shares) 22,928 22,955
Class A Common [Member]
    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Number of votes per share 10  
Numerator [Abstract]    
Distributed earnings 179 103
Undistributed earnings 435 874
Class A Common earnings (loss) $ 614 $ 977
Denominator [Abstract]    
Weighted average shares outstanding - basic (in shares) 2,358 2,781
Total weighted-average diluted Common Stock (in shares) 2,358 2,781
Weighted average shares outstanding (in shares) 2,358 2,781