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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 900,000,000 900,000,000
Common stock, shares issued (in shares) 324,198,057 320,469,049
Common stock, shares outstanding (in shares) 321,231,319 318,377,161
Treasury stock, shares (in shares) 2,966,738 2,091,888