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Condensed Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 0.4 $ 0.3
Preferred stock, par value (usd per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (shares) 50,000,000 50,000,000
Preferred stock, shares issued (shares) 0 0
Preferred stock, shares outstanding (shares) 0 0
Common stock, par value (usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (shares) 300,000,000 300,000,000
Common stock, shares issued (shares) 42,177,357 42,116,430
Common stock shares outstanding (shares) 42,148,524 42,115,824
Treasury shares (in shares) 28,833 606