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Condensed Consolidated Balance Sheets Parenthetical - shares
Sep. 30, 2015
Dec. 31, 2014
Common Class A [Member]    
Common Stock, Shares, Issued 24,174,485 23,971,808
Common Stock, Shares, Outstanding 24,174,363 23,971,686
Common Class B [Member]    
Common Stock, Shares, Issued 5,131,874 5,098,799
Common Stock, Shares, Outstanding 5,130,957 5,097,882
Treasury Class A [Member]    
Treasury Stock, Shares 122 122
Treasury Class B [Member]    
Treasury Stock, Shares 917 917