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Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Customer receivables, allowances	$ 8,561	$ 9,173
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	86,164,986

Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

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