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Trade Accounts Receivable, Net (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Trade Accounts Receivable, Net      
Trade accounts receivable $ 110,133 $ 78,642 $ 94,641
Allowance for doubtful accounts (1,086) (991) (1,457)
Allowance for sales discounts and returns (1,790) (1,231) (2,108)
Trade accounts receivable, net $ 107,257 $ 76,420 $ 91,076