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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Statement of Financial Position [Abstract] |  |
Allowance for doubtful accounts | $ 4.4 | $ 6.0
Common stock, par value (usd per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (shares) | 150,000,000 | 150,000,000
Common stock, shares issued (shares) | 36,624,900 | 36,548,330
Common stock, shares outstanding (shares) | 36,624,900 | 36,548,330
Treasury stock (shares) | 760,782 | 760,782

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