Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets
Accounts receivable, reserves	$ 3,202	$ 2,828
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	99,095,000	97,968,000
Deferred stock units, outstanding	119,000	118,000
Treasury stock, shares	42,892,000	40,657,000

Total number of deferred stock units that have vested but remain unissued as common stock. Deferred stock units issued to employees will generally settle and convert to common stock not earlier than one year following their termination of employment or resignation. With respect to non-employee directors, deferred stock units issued prior to January 1, 2011 will generally settle and convert to common stock not earlier than one year from the date the recipients retire from the board. Deferred stock units issued to non-employee directors on or after January 1, 2011 will generally settle and convert to common stock: (i) not earlier than one year from the date the recipients retire from the board; or (ii) in a lump sum on another single non-discriminatory and objectively determinable date or in four equal annual installments commencing on that date. The shares of common stock associated with these deferred stock units are issuable for no cash consideration, the number of shares of common stock to be issued is fixed and issuance is not contingent.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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