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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
Common stock, Class A, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, Class A, shares authorized (in shares) 120,000,000 120,000,000
Common stock, Class A, shares issued (in shares) 92,029,118 62,555,446
Common stock, Class A, shares outstanding (in shares) 92,029,118 62,555,446