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Trade Accounts Receivable, Net (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Trade Accounts Receivable, Net      
Trade accounts receivable $ 111,726 $ 78,642 $ 100,877
Allowance for doubtful accounts (1,514) (991) (1,210)
Allowance for sales discounts and returns (1,787) (1,231) (1,635)
Trade accounts receivable, net $ 108,425 $ 76,420 $ 98,032