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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