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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets
Accounts receivable, allowance	$ 4,204	$ 3,889
Liabilities and Equity
Common stock, par value	$ 0	$ 0
Common stock, shares authorized (in shares)	120,000,000	120,000,000
Common stock, shares issued (in shares)	44,092,997	37,475,288
Treasury stock, shares (in shares)	1,887,316	2,108,561

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- Definition

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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Issuance value per share of no-par value common stock; generally not indicative of the fair market value per share.

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