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Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Allowance for doubtful accounts | $ 6.6 | $ 7.2
Accumulated depreciation | $ 262.8 | $ 240.5
Preferred stock, par value (in dollars per share) | $ 0 | $ 0
Preferred stock, shares authorized (in shares) | 15,000,000 | 15,000,000
Preferred stock, shares outstanding (in shares) | 0 | 0
Class A common stock |  |
Common stock A and B, par value (in dollars per share) | $ 0 | $ 0
Common stock A and B, shares authorized (in shares) | 100,000,000 | 100,000,000
Common stock A and B, shares issued (in shares) | 22,400,000 | 22,000,000
Common stock A and B, shares outstanding (in shares) | 22,400,000 | 22,000,000
Class B common stock |  |
Common stock A and B, par value (in dollars per share) | $ 0 | $ 0
Common stock A and B, shares authorized (in shares) | 25,000,000 | 25,000,000
Common stock A and B, shares issued (in shares) | 800,000 | 1,000,000
Common stock A and B, shares outstanding (in shares) | 800,000 | 1,000,000

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