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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Allowance for doubtful accounts | $ 7,733 | $ 7,386
Accumulated depreciation | $ 219,271 | $ 197,802
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) | 23,433,000 | 23,968,000
Common stock A and B, shares outstanding (in shares) | 23,433,000 | 23,968,000
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) | 1,000,000 | 1,000,000
Common stock A and B, shares outstanding (in shares) | 1,000,000 | 1,000,000

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