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Discontinued Operations - Disposal of Ethanol Plants (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013 | Jun. 30, 2014 | Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net sales | $ 91,031 | $ 180,072 |  |
Cost of goods sold | 93,313 | 184,225 |  |
Gross loss | (2,282) | (4,153) |  |
General and administrative expenses | 1,682 | 3,393 |  |
Operating loss | (3,964) | (7,546) |  |
Other income (expense): |  |  |  |
Other income | 2,597 | 4,055 |  |
Interest expense | (1,959) | (3,844) |  |
Loss before income taxes | (3,326) | (7,335) |  |
Income tax provision (benefit) | 0 | 0 |  |
Loss from discontinued operations | (3,326) | (7,335) |  |
Current assets: |  |  |  |
Cash and cash equivalents |  |  |  | 267
Prepaid expenses |  |  |  | 1
Other current assets |  |  |  | 164
Assets held for sale |  |  | 0 | 432
Current liabilities: |  |  |  |
Accounts payable |  |  |  | 289
Liabilities held for sale |  |  | $ 0 | $ 289

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