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Trade Accounts Receivable, net (Details) (USD $) In Thousands, unless otherwise specified |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Trade accounts receivable Largest customer
Trade Accounts Receivable, net |  |  |
Trade accounts receivable | $ 85,732 | $ 78,642 |
Allowance for doubtful accounts | (1,288) | (991) |
Allowance for sales discounts | (1,632) | (1,231) |
Trade accounts receivable, net | $ 82,812 | $ 76,420 |
Trade accounts receivable, net |  |  |
Percentage of trade accounts receivable from the largest customer |  |  | 12.00%

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