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Stockholders Equity (Reclassification From Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Revenues $ 986,837 $ 886,263 $ 2,032,124 $ 1,773,947
Loss before income taxes (7,002) (21,545) (32,484) (22,275)
Income Tax Expense (Benefit) (10,753) (9,749) (16,780) (12,130)
Net income (loss) 3,751 (11,796) (15,704) (10,145)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Loss before income taxes 766 2,177 1,549 7,159
Income Tax Expense (Benefit) 185 824 365 2,672
Net income (loss) 581 1,353 1,184 4,487
Ethanol Commodity Derivatives [Member] | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Revenues (313) 2,825 1,448 6,977
Corn Commodity Derivatives [Member] | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of Goods and Services Sold $ 1,079 $ (648) $ 101 $ 182