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Income Taxes - AFMC and CBPC - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2009 tax_credit $ / gal
AFMC for CBPC Exchange [Line Items] |  |  |  |  |
Number of tax credits | tax_credit |  |  |  |  | 2
Valuation allowance | $ 21,861 | $ 18,248 |  |  |
Valuation allowance adjustment | $ 3,613 | 3,607 | $ 0 |  |
Alternative Fuel Mixture Credit |  |  |  |  |
AFMC for CBPC Exchange [Line Items] |  |  |  |  |
Tax credit amount per gallon (USD per gallon) | $ / gal |  |  |  |  | 0.50
Cellulosic Biofuel Producer Credit |  |  |  |  |
AFMC for CBPC Exchange [Line Items] |  |  |  |  |
Tax credit amount per gallon (USD per gallon) | $ / gal |  |  |  |  | 1.01
Valuation allowance |  | 14,600 | $ 13,600 |  |
Valuation allowance adjustment |  | $ 1,000 |  |  |
Exchange of Alternative Fuel Tax Benefit |  |  |  |  |
AFMC for CBPC Exchange [Line Items] |  |  |  |  |
Net tax benefit from AFMC for CBPC exchange |  |  |  | $ 18,800 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition A credit or adjustment for government or taxing authority authorized decrease in taxes owed as a result of meeting certain tax policy conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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