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Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Statement of Financial Position [Abstract] |  |
Customer receivables, allowances | $ 8,067 | $ 8,561
Common stock, par value | $ 0.10 | $ 0.10
Common stock, shares authorized | 140,000,000 | 140,000,000
Common stock, shares outstanding | 86,164,917 | 86,164,917

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