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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2016
Dec. 31, 2015
Class A Common Stock [Member]    
Common stock par value $ 0.01 $ 0.01
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares outstanding 9,693,254 9,156,686
Class B Common Stock [Member]    
Common stock par value $ 0.01 $ 0.01
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares outstanding 23,119,246 23,655,814