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Trade Accounts Receivable, Net (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Trade Accounts Receivable, Net   
Trade accounts receivable$ 100,877$ 70,781$ 97,059
Allowance for doubtful accounts(1,210)(1,344)(1,637)
Allowance for sales discounts and returns(1,635)(1,181)(1,787)
Trade accounts receivable, net$ 98,032$ 68,256$ 93,635