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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 03, 2017
Feb. 26, 2016
Sep. 01, 2015
Operating Loss Carryforwards [Line Items]            
Income tax expense (benefit) allocated to comprehensive income (loss), Tax $ 37 $ 84 $ 83      
Tax act provisional tax expense (benefit) 3,343          
Excess tax benefit from share-based compensation 4,254 1,408        
Illinois Corn Processings LLC            
Operating Loss Carryforwards [Line Items]            
Equity method ownership percentage       30.00% 30.00% 30.00%
Valuation Allowance            
Operating Loss Carryforwards [Line Items]            
Valuation allowance and reserves 148 726 $ 1,444      
Reductions 578 718        
Capital Loss Carryforward            
Operating Loss Carryforwards [Line Items]            
Reductions 690 689        
Operating Loss Carryforward            
Operating Loss Carryforwards [Line Items]            
Reductions 112          
Federal            
Operating Loss Carryforwards [Line Items]            
Excess tax benefit from share-based compensation 4,254 1,408        
State            
Operating Loss Carryforwards [Line Items]            
Excess tax benefit from share-based compensation 371 163        
Operating loss carryforwards 19,979 23,074        
Tax credit carryforward $ 4,416 $ 4,929