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Condensed Consolidated Balance Sheets Parenthetical - shares
Sep. 30, 2017
Dec. 31, 2016
Common Class A [Member]    
Common Stock, Shares, Issued 24,651,943 24,454,048
Common Stock, Shares, Outstanding 24,651,361 24,453,926
Common Class B [Member]    
Common Stock, Shares, Issued 5,113,261 5,123,883
Common Stock, Shares, Outstanding 5,112,344 5,122,966
Treasury Class A [Member]    
Treasury Stock, Shares 582 122
Treasury Class B [Member]    
Treasury Stock, Shares 917 917