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Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Statement of Financial Position [Abstract] |  |
Customer receivables, allowances | $ 9,465 | $ 8,346
Common stock, par value | $ 0.10 | $ 0.10
Common stock, shares authorized | 140,000,000 | 140,000,000
Common stock, shares outstanding | 82,375,945 | 82,416,657

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