Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data	Jun. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts	$ 4,032	$ 4,098
Preferred stock, no par value	$ 0	$ 0
Preferred stock, shares authorized	250	250
Preferred stock, shares issued	0	0
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	50,000	50,000
Common stock, shares issued	17,150	16,571

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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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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