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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |
Income tax expense (benefit) allocated to comprehensive income (loss), Tax | $ 73 | $ 37 | $ 84
Tax act provisional tax expense (benefit) | 3,343 |  |
Net tax benefit due to Tax Cuts and Jobs Act of 2017, percent |  | 6.30% |
Excess tax benefit from share-based compensation | 1,201 | $ 4,254 | 1,408
Valuation Allowance |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowance and reserves | 1,452 | 148 | 726
Decrease | 1,304 | (578) |
Valuation Allowance | Illinois Corn Processings LLC |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Decrease | 379 |  |
Operating Loss Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Decrease | 925 | 112 |
Operating Loss Carryforward | Illinois Corn Processings LLC |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Decrease |  | 690 |
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Excess tax benefit from share-based compensation | 1,201 | 4,254 | 1,408
State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Excess tax benefit from share-based compensation | 236 | 371 | $ 163
Operating loss carryforwards | 21,575 | 19,979 |
Tax credit carryforward | $ 4,107 | $ 4,416 |

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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