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CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 50,000,000.0 50,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 400,000,000 400,000,000
Common stock, shares issued (in shares) 186,709,303.15126 185,034,967
Common stock, shares outstanding (in shares) 186,709,303.15126 185,034,967