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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Vote
Mar. 31, 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%  
Preferential dividend rate of dividend paid on Class A Common Stock (in hundredths) 105.00%  
Number of votes per share 1  
Numerator [Abstract]    
Basic $ 8,260 $ 2,457
Common Stock [Member]
   
Numerator [Abstract]    
Distributed earnings 780 0
Undistributed earnings (loss) 6,503 2,126
Basic 7,283 2,126
Class A Common earnings (loss) 977 331
Diluted 8,260 2,457
Denominator [Abstract]    
Weighted average shares outstanding - basic (in shares) 19,717 18,865
Assumed conversion of Class A Common Stock (in shares) 2,781 3,084
Dilutive options, awards and common stock equivalents (in shares) 457 323
Total weighted-average diluted Common Stock (in shares) 22,955 22,272
Class A Common [Member]
   
Numerator [Abstract]    
Distributed earnings 103 0
Undistributed earnings (loss) 874 331
Class A Common earnings (loss) $ 977 $ 331
Denominator [Abstract]    
Weighted average shares outstanding - basic (in shares) 2,781 3,084
Total weighted-average diluted Common Stock (in shares) 2,781 3,084
Weighted average shares outstanding (in shares) 2,781 3,084