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Condensed Consolidated Balance Sheets Parenthetical - shares
Jun. 30, 2016
Dec. 31, 2015
Common Class A [Member]    
Common Stock, Shares, Issued 24,301,154 24,230,448
Common Stock, Shares, Outstanding 24,301,032 24,230,326
Common Class B [Member]    
Common Stock, Shares, Issued 5,123,258 5,130,558
Common Stock, Shares, Outstanding 5,122,341 5,129,641
Treasury Class A [Member]    
Treasury Stock, Shares 122 122
Treasury Class B [Member]    
Treasury Stock, Shares 917 917