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Trade Accounts Receivable, Net (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Trade Accounts Receivable, Net      
Trade accounts receivable $ 105,880 $ 85,732 $ 110,133
Allowance for doubtful accounts (1,134) (1,288) (1,086)
Allowance for sales discounts and returns (1,933) (1,632) (1,790)
Trade accounts receivable, net $ 102,813 $ 82,812 $ 107,257