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Condensed Consolidated Balance Sheets Parenthetical
Jun. 30, 2013
Dec. 31, 2012
Common Class A [Member]
    
Common Stock, Shares, Issued 23,500,882 23,332,532
Common Stock, Shares, Outstanding 23,500,760 23,332,410
Common Class B [Member]
    
Common Stock, Shares, Issued 5,089,371 5,149,771
Common Stock, Shares, Outstanding 5,088,454 5,148,854
Treasury Class A [Member]
    
Treasury Stock, Shares 122 122
Treasury Class B [Member]
    
Treasury Stock, Shares 917 917