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Condensed Consolidated Balance Sheets Parenthetical
Jun. 30, 2012
Dec. 31, 2011
Common Class A [Member]
    
Common Stock, Shares, Issued 23,193,951 23,020,215
Common Stock, Shares, Outstanding 23,193,829 23,020,215
Common Class B [Member]
    
Common Stock, Shares, Issued 5,106,139 5,164,765
Common Stock, Shares, Outstanding 5,105,222 5,164,765
Treasury Class A [Member]
    
Treasury Stock, Shares 122 0
Treasury Class B [Member]
    
Treasury Stock, Shares 917 0