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Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Balance Sheets [Abstract]
Customer receivables, allowances	$ 9,173	$ 8,475
Common stock, par value	$ 0.1	$ 0.1
Common stock, shares authorized	70,000,000	70,000,000
Common stock, shares outstanding	57,443,324	55,926,945

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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