Renewable Energy (REGI) 10-Q 8 Aug 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 31, 2014
Document Document And Entity Information [Abstract]	'	'
Entity Registrant Name	'Renewable Energy Group, Inc.	'
Entity Central Index Key	'0001463258	'
Document Type	'10-Q	'
Document Period End Date	30-Jun-14	'
Amendment Flag	'false	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	42,306,595

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
CURRENT ASSETS:	'	'
Cash and cash equivalents	$55,623	$153,227
Marketable securities	70,289	0
Accounts receivable, net (includes amounts owed by related parties of $247 and $426, respectively)	48,419	82,911
Inventories	70,151	85,814
Prepaid expenses and other assets	40,302	25,568
Total current assets	284,784	347,520
Property, plant and equipment, net	445,969	286,044
Property, plant and equipment, net—variable interest entity	5,066	5,180
Goodwill	175,472	84,864
Intangible assets, net	29,753	4,867
Other assets (includes amounts owed by related parties of $0 and $35, respectively)	26,737	12,380
Restricted cash	101,315	0
TOTAL ASSETS	1,069,096	740,855
CURRENT LIABILITIES:	'	'
Revolving line of credit	19,825	10,986
Current maturities of long-term debt	6,557	6,729
Current maturities of long-term debt—variable interest entity	303	300
Accounts payable (includes amounts owed to related parties of $662 and $552, respectively)	49,688	48,727
Accrued expenses and other liabilities	12,935	12,305
Deferred income taxes	4,873	3,687
Deferred revenue	3,004	15,503
Total current liabilities	97,185	98,237
Unfavorable lease obligation	7,341	7,905
Deferred income taxes	2,955	2,691
Contingent consideration for acquisitions	40,470	0
Long-term debt	239,080	23,422
Long-term debt—variable interest entity	3,578	3,729
Other liabilities	4,834	6,838
Total liabilities	395,443	142,822
COMMITMENTS AND CONTINGENCIES (Note 15)	'	'
EQUITY:	'	'
Common stock ($.0001 par value; 300,000,000 shares authorized; 42,306,595 and 36,506,221 shares outstanding, respectively)	4	4
Common stock—additional paid-in-capital	430,437	359,818
Retained earnings	247,120	238,134
Accumulated other comprehensive loss	-22	0
Treasury stock (530,898 and 530,898 shares outstanding, respectively)	-3,886	-3,886
Total stockholders’ equity	673,653	594,070
TOTAL LIABILITIES AND EQUITY	1,069,096	740,855
Series B Preferred Stock	'	'
CURRENT LIABILITIES:	'	'
Series B preferred stock ($.0001 par value; 3,000,000 shares authorized; 0 and 143,313 shares outstanding; redemption amount $0 and $3,583, respectively)	$0	$3,963

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Accounts receivable, amounts owed by related parties	$247	$426
Other assets, amounts owed by related parties	0	35
Accounts payable, amounts owed to related parties	662	552
Preferred stock, par or stated value per share	$0.00	$0.00
Preferred stock, shares authorized	3,000,000	3,000,000
Preferred stock, shares outstanding	0	143,313
Preferred stock, redemption amount	$0	$3,583
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares, outstanding	42,306,595	36,506,221
Treasury stock, shares outstanding	530,898	530,898

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (Unaudited) Statement (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
REVENUES:	'	'	'	'
Biodiesel sales	$327,837	$340,111	$536,959	$529,366
Biodiesel government incentives	5,022	44,577	14,912	119,648
Total biodiesel sales	332,859	384,688	551,871	649,014
Services	59	47	87	89
Total revenues	332,918	384,735	551,958	649,103
COSTS OF GOODS SOLD:	'	'	'	'
Biodiesel	303,462	321,074	503,767	486,957
Biodiesel—related parties	14,283	13,411	21,429	25,141
Services	22	69	47	129
Total cost of goods sold	317,767	334,554	525,243	512,227
GROSS PROFIT	15,151	50,181	26,715	136,876
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	15,627	11,226	29,154	20,870
INCOME (LOSS) FROM OPERATIONS	-476	38,955	-2,439	116,006
OTHER INCOME (EXPENSE), NET:	'	'	'	'
Change in fair value of contingent consideration	384	0	384	0
Other income, net	384	93	432	210
Interest expense	-1,204	-604	-1,755	-1,180
Total other income (expenses)	-436	-511	-939	-970
INCOME (LOSS) BEFORE INCOME TAXES	-912	38,444	-3,378	115,036
INCOME TAX BENEFIT (EXPENSE)	11,919	-15,314	12,026	-45,503
NET INCOME	11,007	23,130	8,648	69,533
PLUS—GAIN ON REDEMPTION OF PREFERRED STOCK	0	0	378	0
PLUS—CHANGE IN UNDISTRIBUTED DIVIDENDS ALLOCATED TO PREFERRED STOCKHOLDERS	0	839	0	0
LESS—DISTRIBUTED DIVIDENDS TO PREFERRED STOCKHOLDERS	0	-1,590	-40	-1,590
LESS—EFFECT OF PARTICIPATING PREFERRED STOCK	0	-2,491	0	-9,001
LESS—EFFECT OF PARTICIPATING SHARE-BASED AWARDS	-172	-315	-128	-935
NET INCOME ATTRIBUTABLE TO THE COMPANY’S COMMON STOCKHOLDERS	$10,835	$19,573	$8,858	$58,007
NET INCOME PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS:	'	'	'	'
BASIC	$0.27	$0.63	$0.23	$1.87
DILUTED	$0.27	$0.62	$0.22	$1.87
WEIGHTED AVERAGE SHARES USED TO COMPUTE NET INCOME PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS:	'	'	'	'
BASIC	39,939,346	31,292,910	39,119,430	30,967,903
DILUTED	39,954,587	36,683,764	39,129,136	36,655,958

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) Statement (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income	$11,007	$23,130	$8,648	$69,533
Unrealized gains (losses) on marketable securities, net of taxes of $0 and $0, respectively	30	0	-22	0
Other comprehensive income (loss)	30	0	-22	0
Comprehensive income	$11,037	$23,130	$8,626	$69,533

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Taxes on unrealized losses on marketable securities	$0	$0	$0	$0

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Redeemable Preferred Stock and Equity (Unaudited) (USD $)	Total	Redeemable Preferred Stock	Common Stock	Common Stock - Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
In Thousands, except Share data, unless otherwise specified
Beginning Balance at Dec. 31, 2012	$324,764	$83,043	$3	$274,136	$53,823	$0	($3,198)
Beginning Balance, shares at Dec. 31, 2012	'	2,995,106	30,559,935	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'
Issuance of common stock	423	'	'	423	'	'	'
Issuance of common stock, shares	'	'	58,501	'	'	'	'
Conversion of Series B Preferred Stock to common stock	24,055	-23,671	'	24,055	'	'	'
Conversion of Series B Preferred Stock to common stock, Shares	'	-853,604	1,736,877	'	'	'	'
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased)	-158	'	'	'	'	'	-158
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased), Shares	'	'	70,515	'	'	'	'
Stock compensation expense	2,385	'	'	2,385	'	'	'
Net change in unrealized losses on marketable securities	0	'	'	'	'	'	'
Series B Preferred Stock dividends paid	-1,590	'	'	'	-1,590	0	'
Excess tax benefit over book expense from restricted stock unit conversions	105	0	0	105	0	0	0
Net income	69,533	'	'	'	69,533	'	'
Ending Balance at Jun. 30, 2013	419,517	59,372	3	301,104	121,766	0	-3,356
Ending Balance, Shares at Jun. 30, 2013	'	2,141,502	32,425,828	'	'	'	'
Beginning Balance at Dec. 31, 2013	594,070	3,963	4	359,818	238,134	0	-3,886
Beginning Balance, shares at Dec. 31, 2013	'	143,313	36,506,221	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'
Issuance of common stock	582	'	'	582	'	'	'
Issuance of common stock, shares	'	'	49,662	'	'	'	'
Conversion of Series B Preferred Stock to common stock	23	-23	'	23	'	'	'
Conversion of Series B Preferred Stock to common stock, Shares	'	-816	1,634	'	'	'	'
Preferred stock redemption	378	-3,940	'	'	378	'	'
Preferred stock redemption, shares	'	-142,497	'	'	'	'	'
Issuance of common stock in acquisition (net of issuance costs of $884)	60,201	'	'	60,201	'	'	'
Issuance of common stock in acquisition, shares	'	'	5,724,172	'	'	'	'
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased)	0	'	'	'	'	'	'
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased), Shares	'	'	24,906	'	'	'	'
Convertible notes conversion feature (net of taxes of $5,082 and net of issuance cost of $881)	19,068	'	'	19,068	'	'	'
Purchase of capped call transactions	-11,904	'	'	-11,904	'	'	'
Stock compensation expense	2,649	'	'	2,649	'	'	'
Net change in unrealized losses on marketable securities	-22	'	'	'	'	-22	'
Series B Preferred Stock dividends paid	-40	'	'	'	-40	'	'
Net income	8,648	'	'	'	8,648	'	'
Ending Balance at Jun. 30, 2014	$673,653	$0	$4	$430,437	$247,120	($22)	($3,886)
Ending Balance, Shares at Jun. 30, 2014	'	0	42,306,595	'	'	'	'

Condensed_Consolidated_Stateme4

Condensed Consolidated Statements of Redeemable Preferred Stock and Equity (Unaudited) (Parenthetical) (USD $)	6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Statement of Stockholders' Equity [Abstract]	'	'
Issuance cost of common stock issued in acquisition	$884	'
Conversion of restricted stock units to common stock, shares of treasury stock purchased	'	21,675
Taxes on convertible notes conversion feature	5,082	'
Issuance costs on convertible notes conversion feature	$881	'

Condensed_Consolidated_Stateme5

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:	'	'
Net income	$8,648	$69,533
Adjustments to reconcile net income to net cash flows from operating activities:	'	'
Depreciation expense	6,194	4,376
Amortization expense of assets and liabilities, net	-155	-253
Accretion of convertible note discount	351	0
Change in fair value of contingent consideration	-384	0
Gain on disposal of property, plant and equipment	0	67
Provision for doubtful accounts	-33	-117
Stock compensation expense	2,649	2,385
Deferred tax expense (benefit)	-12,810	3,456
Other operating activities	257	0
Changes in asset and liabilities, net of effects from acquisitions:	'	'
Accounts receivable, net	35,070	-58,250
Inventories	17,610	-31,624
Prepaid expenses and other assets	-12,637	-9,940
Accounts payable	-2,769	23,660
Accrued expenses and other liabilities	-5,319	40,332
Deferred revenue	-12,499	573
Net cash flows provided by operating activities	24,173	44,064
CASH FLOWS FROM INVESTING ACTIVITIES:	'	'
Cash paid for marketable securities	-70,553	0
Cash proceeds from involuntary disposal of fixed assets	0	330
Change in restricted cash	101,315	0
Cash paid for purchase of property, plant and equipment	-32,310	-20,057
Cash paid for acquisitions, net of cash acquired	-31,469	0
Cash paid for issuance of note receivable	0	-519
Other investing activities	27	-58
Net cash flows used in investing activities	-235,620	-20,304
CASH FLOWS FROM FINANCING ACTIVITIES:	'	'
Borrowings on line of credit	645,619	643,148
Repayments on line of credit	-636,780	-633,715
Cash received from issuance of debt	143,750	3,000
Cash paid for capped call transactions	-11,904	0
Cash paid on debt	-17,285	-6,025
Cash paid for debt issuance costs	-3,904	-47
Cash paid for equity issuance costs	1,522	25
Cash paid for treasury stock	-529	-282
Cash paid for preferred stock dividends	-40	-1,205
Cash paid for redemption of preferred stock	3,562	0
Excess tax benefit over book expense from restricted stock unit conversions	0	105
Net cash flows provided by financing activities	113,843	4,954
NET CHANGE IN CASH AND CASH EQUIVALENTS	-97,604	28,714
CASH AND CASH EQUIVALENTS, Beginning of period	153,227	66,785
CASH AND CASH EQUIVALENTS, End of period	55,623	95,499
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION:	'	'
Cash received for income taxes	84	2,111
Cash paid for interest	1,059	940
Amounts included in period-end accounts payable for:	'	'
Purchases of property, plant and equipment	4,700	2,459
Debt issuance cost	469	'
Incentive stock liability for raw material supply agreement	206	239
Equity issuance costs	218	'
Issuance of common stock for acquisitions	61,085	'
Contingent consideration for acquisitions	45,950	'
Debt assumed in acquisition	113,553	'
Gain on redemption of preferred stock	378	'
Issuance of common stock for dividends	'	$385

Basis_of_Presentation_and_Natu

Basis of Presentation and Nature of the Business	6 Months Ended
	Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Basis of Presentation and Nature of the Business	'
	BASIS OF PRESENTATION AND NATURE OF THE BUSINESS
	The condensed consolidated financial statements have been prepared by Renewable Energy Group, Inc. and its subsidiaries (the Company), pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (SEC). Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) have been condensed or omitted as permitted by such rules and regulations. All adjustments, consisting of normal recurring adjustments, have been included. Management believes that the disclosures are adequate to present fairly the financial position, results of operations and cash flows at the dates and for the periods presented. It is suggested that these interim financial statements be read in conjunction with the consolidated financial statements and the notes thereto appearing in the Company’s latest annual report on Form 10-K. Results for interim periods are not necessarily indicative of those to be expected for the fiscal year.
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts and related disclosures. Actual results could differ from those estimates.
	On January 22, 2014, REG Life Sciences, LLC (REG Life Sciences), a wholly-owned subsidiary of the Company, acquired substantially all of the assets and certain liabilities of LS9, Inc. (LS9) as part of its strategy to expand into the production of renewable chemicals, additional advanced biofuels and other products. LS9 was a development stage company focused on researching and developing technology to harness the power of microbial fermentation to develop and produce renewable chemicals, fuels and other products.
	On June 3, 2014, REG Synthetic Fuels, LLC (REG Synthetic Fuels), a wholly-owned subsidiary of the Company, acquired substantially all of the assets of Syntroleum Corporation (Syntroleum), which consisted of a 50% limited liability company membership in Dynamic Fuels, LLC (Dynamic Fuels), as well as Syntroleum's intellectual property and other assets. Dynamic Fuels owns a 75 million gallon per year nameplate capacity renewable diesel biorefinery located in Geismar, Louisiana. On June 6, 2014, REG Synthetic Fuels acquired the remaining 50% limited liability membership interest in Dynamic Fuels from Tyson Foods, Inc. (Tyson Foods). The Company renamed Dynamic Fuels to REG Geismar, LLC and will be cross-referenced in this report.
	The biomass-based diesel industry and the Company’s business have benefited from certain federal and state incentives. The federal biomass-based diesel mixture excise tax credit (BTC) expired on December 31, 2013 and it is uncertain whether it will be reinstated. This expiration, along with other amendments of any one or more of those laws or incentives, could adversely affect the financial results of the Company.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	We have disclosed a summary of the Company's significant accounting policies in the December 31, 2013 Annual Report on Form 10-K. There have been no material changes from the policies previously disclosed other than those noted below.
	Restricted Cash
	Restricted cash consists of funds that are held in an escrow account totaling $101,315 and $0 as of June 30, 2014 and December 31, 2013, respectively, which have been restricted in accordance with the terms of the escrow account for the benefit of Tyson Foods in connection with our acquisition of Dynamic Fuels. For additional information, see Note 9 - Debt. The Company classifies restricted cash between current and non-current assets based on the length of time of the restricted use.
	Marketable Securities
	The Company’s marketable securities are classified as available-for-sale and are reported at fair value, with unrealized gains and losses, net of tax, recorded in accumulated other comprehensive income (loss). Realized gains or losses and declines in value judged to be other-than-temporary, if any, on available-for-sale securities are reported in other income, net. The Company evaluates the investments periodically for possible other-than-temporary impairment. A decline of fair value below amortized costs of debt securities is considered an other-than-temporary impairment if the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of the entire amortized cost basis. In those instances, an impairment charge equal to the difference between the fair value and the amortized cost basis is recognized in earnings. Regardless of the Company’s intent or requirement to sell a debt security, an impairment is considered other-than-temporary if the Company does not expect to recover the entire amortized cost basis; in those instances, a credit loss equal to the difference between the present value of the cash flows expected to be collected based on credit risk and the amortized cost basis of the debt security is recognized in earnings. The Company has no current requirement or intent to sell a material portion of marketable securities as of June 30, 2014. The Company expects to recover up to (or beyond) the initial cost of investment for securities held. In computing realized gains and losses on available-for-sale securities, the Company determines cost based on amounts paid, including direct costs such as commissions to acquire the security, using the specific identification method. There were no gross realized gains and losses on available-for-sale securities during the three and six months ended June 30, 2014 and 2013, respectively.
	Contingent Consideration for Acquisitions
	Contingent considerations in a purchase business combination are established at the time of the acquisition (See Note 3 - Acquisitions). The contingent consideration is adjusted to fair value at each reporting period. The change in fair value is included in change in fair value of contingent consideration on the Condensed Consolidated Statements of Operations.
	Research and Development Costs
	Research and development (R&D) costs are charged to expense as incurred. R&D expense was $3,217 and $5,090 for the three and six months ended June 30, 2014, respectively, and $14 and $74 for the three and six months ended June 30, 2013, respectively. In process research and development (IPR&D) assets acquired in connection with acquisitions (if applicable) are recorded on the Condensed Consolidated Balance Sheets as intangible assets. Acquired IPR&D is initially assigned an indefinite life and is subject to impairment testing until the completion or abandonment of the associated R&D efforts. If abandoned, the carrying value of the IPR&D asset is expensed. Once the associated R&D efforts are completed, the carrying value of the IPR&D is reclassified as a finite-lived asset and is amortized over its useful life.
	Convertible Debt
	In June 2014, the Company issued $143,750 in convertible senior notes. Applicable authoritative accounting guidance requires that the conversion feature be assigned a fair value and that feature reduce the initial recorded value of the liability component of the convertible senior notes. This conversion feature is recorded in equity on a net of tax basis. The discount on the liability component is being amortized through interest expense until the maturity date of June 15, 2019. See "Note 9 - Debt" for a further description of the transaction.
	Capped Call Transaction
	In connection with the issuance of the convertible senior notes, the Company entered into capped call transactions. The purchased capped call transactions were recorded as a reduction to common stock-additional paid-in-capital. Because this was considered to be an equity transaction and qualifies for the derivative scope exception, no future changes in the fair value of the capped call will be recorded by the Company.
	Income Taxes
	The change in the valuation allowance for the three and six months ended June 30, 2014 was mainly attributable to the acquisition of Syntroleum and Dynamic Fuels. Specifically, in connection with the acquisition of Syntroleum and Dynamic Fuels, the Company acquired a net deferred tax liability of $7,278 that will produce future taxable income. The increase in the gross deferred tax liability results in a reduction to the Company's valuation allowance which has been recognized as a tax benefit discretely in the current quarter.
	Under the rules prescribed by Internal Revenue Code (IRC) Section 382 and applicable regulations, if certain transactions occur with respect to an entity's capital stock that result in a cumulative ownership shift of more than 50 percentage points by 5% stockholders over a testing period, annual limitations are imposed with respect to the entity's ability to utilize its net operating loss carryforwards. During the six months ended June 30, 2014, the Company recorded an increase to the deferred tax assets for net operating loss carryforwards from Syntroleum of approximately $22,600 on a pre-tax basis (after IRC Section 382 limitation). IRC Section 382 limits the Company's ability to realize these net operating losses, which begin to expire in 2018 and are fully offset by a valuation allowance. The Company has not completed its accounting for the business combinations related to the Syntroleum and Dynamic Fuels acquisitions, and we continue to assess the recognition, measurement, and realizability of these deferred tax assets, and any changes thereto will be recorded in the accounting for the business combination.
	New Accounting Standards
	In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers: Summary and Amendments that Create Revenue from Contracts with Customers and Other Assets and Deferred Costs—Contracts with Customers. The guidance in this update supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition, and most industry-specific guidance throughout the industry topics of the codification. For public companies, this update will be effective for interim and annual periods beginning after December 15, 2016. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements, but does not expect the guidance to have a material impact on the Company's consolidated financial statements.

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Acquisition of LS9, Inc.	'
	ACQUISITIONS
	LS9, Inc.
	On January 22, 2014, REG Life Sciences, a wholly-owned subsidiary of the Company, acquired substantially all of the assets and certain liabilities of LS9. The Company has completed its initial accounting for this business combination in the second quarter when the valuation of the contingent consideration, in-process research & development intangible assets and goodwill acquired was finalized. The following table summarizes the consideration paid for LS9 and the amounts of assets acquired and liabilities assumed at the acquisition date:
		January 22, 2014
	Consideration at fair value:
	Cash	$	15,275
	Common stock	26,254
	Contingent consideration	17,050
	Total	$	58,579
		22-Jan-14
	Assets (liabilities) acquired:
	Property, plant and equipment	$	8,215
	In-process research & development intangible assets	15,956
	Goodwill	34,846
	Other noncurrent liabilities	(438		)
	Total	$	58,579
	The fair value of the 2,230,559 Common Stock issued as part of the consideration paid for LS9 was determined on the basis of the closing market price of the Company's common shares at the date of acquisition.
	Subject to achievement of certain milestones related to the development and commercialization of products from LS9’s technology, LS9 may receive contingent consideration of up to $21,500 (Earnout Payments) over a five-year period after the acquisition. The Earnout Payments will be payable in cash, the Company's stock or a combination of cash and stock at the Company's election. As of June 30, 2014, the Company has recorded a contingent liability of $16,666, all of which has been classified as non-current on the Condensed Consolidated Balance Sheets.
	The goodwill acquired is included in the Biodiesel segment, a portion of which is expected to be deductible for tax purposes.
	REG Life Sciences had no revenues for the three and six months ended June 30, 2014. The net loss generated by REG Life Sciences for the three and six months ended June 30, 2014, included in the Condensed Consolidated Statement of Operations was $2,822 and $4,663, respectively.
	Syntroleum Corporation/Dynamic Fuels, LLC
	On June 3, 2014, REG Synthetic Fuels, a wholly-owned subsidiary of the Company included in the Biodiesel segment, acquired substantially all the assets of Syntroleum, which consisted of a 50% limited liability company membership interest in Dynamic Fuels, as well as intellectual property and other assets. Dynamic Fuels owns a 75 million gallon per year nameplate capacity renewable diesel biorefinery located in Geismar, Louisiana. The Company has not completed its initial accounting for this business combination as the valuation of the intangible assets and goodwill acquired has not been finalized. The following table summarizes the consideration paid for Syntroleum.
		June 3, 2014
	Consideration at fair value for Syntroleum:
	Common stock	$	34,831
	The fair value of the 3,493,613 shares of Common Stock issued to Syntroleum was determined on the basis of the closing market price of the Company's common shares at the date of acquisition.
	The fair value of the Syntroleum renewable diesel technology was determined using the relief from royalty method, or RFR, which reflects the savings realized by owning the intangible assets. The value under RFR method is dependent upon the following factors for an asset: royalty rate, discount rate, expected life and projected revenue.
	On June 6, 2014, REG Synthetic Fuels acquired the remaining 50% ownership interest in Dynamic Fuels, from Tyson Foods. The Company renamed Dynamic Fuels to REG Geismar, LLC and included in the Biodiesel segment. The Company has not completed its initial accounting for this business combination as the valuation of the real and personal property, contingent consideration, intangible assets and goodwill acquired has not been finalized.
	The following table summarizes the consideration paid to Tyson Foods for Dynamic Fuels:
		June 6, 2014
	Consideration at fair value for Dynamic Fuels:
	Cash	$	16,447
	Contingent consideration	28,900
	Total	$	45,347
	The following table summarizes the amount of assets acquired and liabilities assumed at the acquisition date for the combined acquisition of Syntroleum and Dynamic Fuels:
		6-Jun-14
	Assets (liabilities) acquired of Syntroleum and Dynamic Fuels:
	Cash	$	253
	Other current assets	4,666
	Property, plant and equipment	122,827
	Goodwill	55,762
	Intangible assets	8,900
	Other noncurrent assets	10,281
	Other current liabilities	(1,180		)
	Deferred tax liabilities	(7,278		)
	Debt	(113,553		)
	Other noncurrent liabilities	(500		)
	Total	$	80,178
	Subsequent to the closing of the Tyson Foods transaction, REG Geismar paid off the debt owed to Tyson Foods in the amount of $13,553.
	Subject to achievements related to the sale of renewable diesel at the REG Geismar production facility, Tyson Foods may receive contingent consideration of up to $35,000. The Company will pay contingent consideration, if and when, the Company achieves certain production volumes. The agreement calls for periodic payments based on pre-determined payments per gallon of product sold. The probability weighted contingent payments were discounted using a risk adjusted discount rate of 5.8%. The contingent payments will be payable in cash. As of June 30, 2014, the Company has recorded a contingent liability of $28,900, of which $5,096 has been classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets
	The goodwill acquired is included in the Biodiesel segment, a portion of which is expected to be deductible for tax purposes.
	From the acquisition dates through June 30, 2014, REG Synthetic Fuels, including its wholly-owned subsidiary REG Geismar, had $50 in revenues. The net loss generated by REG Synthetic Fuels from the acquisition dates through June 30, 2014 included in the Condensed Consolidated Statement of Operations was $4,850, which includes $3,301 of income tax expense, resulting from the recording of a valuation allowance offsetting their deferred tax assets.
	The following pro forma condensed combined results of operations assume that LS9, Syntroleum and Dynamic Fuels acquisitions were completed as of January 1, 2013:
		Three Months			Three Months		Six Months			Six Months
		Ended			Ended		Ended			Ended
		June 30,			June 30,		June 30,			June 30,
		2014			2013		2014			2013
	Revenue	$	333,099		$	385,451	$	552,501		$	677,229
	Net income	5,120			12,123		(6,735		)	65,752
	Basic net income (loss) per share	$	0.12		$	0.33	$	(0.16	)	$	1.79

Marketable_Securities_Notes

Marketable Securities (Notes)	6 Months Ended
	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Marketable Securities	'
	MARKETABLE SECURITIES
	The Company's investments in marketable securities are stated at fair value and are available-for-sale. The following table summarizes the Company's marketable securities:
		As of June 30, 2014
		Maturity	Gross Amortized Cost		Fair Value		Total Unrealized Gains		Total Unrealized Losses
	Commercial paper	Within one year	$	32,958	$	32,963	$	5	$	—
	Corporate bonds	Within one year	26,393		26,384		—		(9		)
	Certificates of deposit	Within one year	10,960		10,942		—		(18		)
	Total		$	70,311	$	70,289	$	5	$	(27	)

Inventories

Inventories	6 Months Ended
	Jun. 30, 2014
Inventory Disclosure [Abstract]	'
Inventories	'
	INVENTORIES
	Inventories consist of the following:
		30-Jun-14		31-Dec-13
	Raw materials	$	21,412	$	13,393
	Work in process	1,925		1,456
	Finished goods	46,814		70,965
	Total	$	70,151	$	85,814

Prepaid_Expenses_and_Other_Ass

Prepaid Expenses and Other Assets	6 Months Ended
	Jun. 30, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]	'
Prepaid Expenses and Other Assets	'
	OTHER ASSETS
	Prepaid expense and other assets consist of the following:
		30-Jun-14		31-Dec-13
	Commodity derivatives and related collateral, net	$	12,155	$	13,675
	Prepaid expenses	4,294		2,414
	Deposits	4,326		293
	RIN inventory	16,649		6,455
	Income taxes receivable	1,328		2,197
	Other	1,550		534
	Total	$	40,302	$	25,568
	RIN inventory values were adjusted in the amount of $192 and $1,277 at June 30, 2014 and December 31, 2013, respectively, to reflect the lower of cost or market.
	Other noncurrent assets consist of the following:
		June 30, 2014		December 31, 2013
	Investments	$	7,368	$	7,351
	Debt issuance costs (net of accumulated amortization of $728 and $715, respectively)	4,974		832
	Spare parts inventory	3,671		3,671
	Deposits	3,780		—
	Other	6,944		526
	Total	$	26,737	$	12,380

Goodwill_Notes

Goodwill (Notes)	6 Months Ended
	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill	'
	GOODWILL
	The following table shows the carrying amount of goodwill by reportable segment as of December 31, 2013 and the changes in goodwill for the six months ended June 30, 2014:
		Biodiesel		Services		Total
	Balance, December 31, 2013	$	68,784	$	16,080	$	84,864
	Acquisitions	90,608		—		90,608
	Balance, June 30, 2014	$	159,392	$	16,080	$	175,472

Intangible_Assets

Intangible Assets	6 Months Ended
	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Intangible Assets	'
	INTANGIBLE ASSETS
	Intangible assets consist of the following:
		30-Jun-14
		Cost		Accumulated Amortization			Net		Weighted Average Remaining Life
	Raw material supply agreement	$	5,708	$	(922	)	$	4,786	11.5 years
	Renewable diesel technology	8,300		—			8,300		15.0 years
	Trademarks	600		—			600		15.0 years
	Ground lease	200		(89		)	111		7.4 years
	Total amortizing intangibles	14,808		(1,011		)	13,797
	In-process research and development, indefinite lives	15,956		—			15,956
	Total intangible assets	$	30,764	$	(1,011	)	$	29,753
		31-Dec-13
		Cost		Accumulated Amortization			Net		Weighted Average Remaining Life
	Raw material supply agreement	$	5,502	$	(753	)	$	4,749	12.0 years
	Ground lease	200		(82		)	118		7.9 years
	Total amortizing intangibles	5,702		(835		)	4,867
	In-process research and development, indefinite lives	—		—			—
	Total intangible assets	$	5,702	$	(835	)	$	4,867
	The Company recorded intangible amortization expense of $93 and $177 for the three and six months ended June 30, 2014, respectively, and $78 and $147 for the three and six months ended June 30, 2013, respectively.
	The estimated intangible asset amortization expense for fiscal year 2014 through fiscal year 2018 and thereafter is as follows:
	July 1, 2014 through December 31, 2014	$	561
	2015	1,068
	2016	1,082
	2017	1,096
	2018	1,111
	2019 and thereafter	8,879
	Total	$	13,797

Debt

Debt	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Borrowings	'
	The Company’s debt is as follows:
		30-Jun-14		31-Dec-13
	Convertible debt	$	119,070	$	—
	REG Geismar GOZone bonds	100,000		—
	REG Danville term loan	3,525		5,626
	REG Newton term loan	16,880		18,143
	REG Mason City term loan	4,923		5,135
	Other	1,239		1,247
	Total debt	$	245,637	$	30,151
	Bell, LLC promissory note—variable interest entity	$	3,881	$	4,029
	Convertible Debt
	In June 2014, the Company issued $143,750 in convertible senior notes (Convertible Notes) with a maturity date of June 15, 2019, unless earlier converted or repurchased. The Convertible Notes bear interest at a rate of 2.75% per annum, payable semi-annually in arrears on June 15 and December 15 of each year, beginning December 15, 2014.
	Prior to December 15, 2018, holders may convert all or any portion of their Convertible Notes only under the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on September 30, 2014 (and only during such calendar quarter), if the last reported sale price of the Common Stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price of the Convertible Notes on each applicable trading day; (2) during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of Convertible Notes for each trading day of such five consecutive trading day period was less than 98% of the product of the last reported sale price of the Common Stock and the conversion rate of the Convertible Notes on each such trading day; or (3) upon the occurrence of specified corporate events. On or after December 15, 2018 until the close of business on the second scheduled trading day immediately preceding the maturity date of the Convertible Notes, holders may convert their Convertible Notes at any time, regardless of the foregoing circumstances. Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of Common Stock or a combination of cash and shares of Common Stock, at the Company’s election. If the Company satisfies its conversion obligation solely in cash or through payment and delivery, as the case may be, of a combination of cash and shares of Common Stock, the amount of cash and shares of Common Stock, if any, due upon conversion will be based on a daily conversion value calculated for each trading day in an 80 trading day observation period. The Company's intent is to settle the principal amount of the Senior Notes in cash upon conversion. If the conversion value exceeds the principal amount, the Company would deliver shares of its common stock in respect to the remainder of its conversion obligation in excess of the aggregate principal amount (conversion spread).
	The initial conversion rate is 75.3963 shares of Common Stock per $1 principal amount of Convertible Notes, which represents an initial conversion price of approximately $13.26 per share. The conversion rate will be subject to adjustment in some events but will not be adjusted for any accrued and unpaid interest. In addition, following certain corporate events that occur prior to the stated maturity date, the Company will increase the conversion rate for a holder who elects to convert in connection with such a corporate event in certain circumstances.
	Upon a fundamental change, subject to certain conditions, holders may require the Company to repurchase for cash all or a portion of their Convertible Notes at a purchase price in cash that will generally be equal to 100% of the principal amount of the Convertible Notes to be repurchased, plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date. The Convertible Notes are not redeemable at the Company’s option prior to maturity.
	In accounting for the issuance of the Convertible Notes, the Company separated the Convertible Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the estimated fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the face value of the Convertible Notes as a whole. The excess of the face amount of the liability component over its carrying amount is amortized to interest expense over the term of the Convertible Notes using the effective interest method with an effective interest rate of 3.80% per annum. The gross proceeds of $143,750 were accordingly allocated between long-term debt for $118,719 and stockholders' equity $25,031. Issuance costs of $4,563 which were allocated between deferred financing costs and equity.
	In connection with the issuance of the Convertible Notes, the Company entered into capped call transactions (Capped Call) with Bank of America, N.A. and Wells Fargo Bank (Option Counterparties), for the purpose of reducing potential dilution of earnings per share upon conversion of the Convertible Notes. Under the Capped Call, the Company purchased from the Option Counterparties capped call options that in aggregate relate to 92.5% of the total number of shares of the Company's Common Stock underlying the Convertible Notes, with a strike price equal to the conversion price of the Convertible Notes and with a cap price equal to $16.02 per share. The capped calls were purchased for $11,904 and recorded as a reduction to common stock-additional paid-in-capital.
	The Capped Call is expected generally to reduce the potential dilution to the Common Stock and/or offset potential cash payments the Company is required to make in excess of the principal amount to the extent of such percentage upon conversion of the Convertible Notes in the event that the market price per share of the Common Stock, as measured under the terms of the Capped Call, is greater than the strike price of the Capped Call, which initially corresponds to the conversion price of the Convertible Notes and is subject to anti-dilution adjustments substantially similar to those applicable to the conversion rate of the Convertible Notes, with such reduction and/or offset subject to a cap in the event that the market price per share of the Common Stock, as measured under the terms of the Capped Call, is greater than the cap price of the Capped Call.
	The Company will not be required to make any cash payments to the Option Counterparties or their respective affiliates upon the exercise of the options that are a part of the Capped Call, but the Company will be entitled to receive from them a number of shares of Common Stock and/or an amount of cash generally based on the amount by which the market price per share of the Common Stock, as measured under the terms of the Capped Call, is greater than the strike price of the Capped Call during the relevant valuation period under the Capped Call, with such number of shares of Common Stock and amounts of cash, if any, subject to the cap.
	The Capped Call is a separate transaction entered into by the Company with the Option Counterparties, are not part of the terms of the Convertible Notes and will not change the holders' rights under the Convertible Notes.
	REG Geismar, LLC (formerly named Dynamic Fuels, LLC)
	In October 2008, Dynamic Fuels received $100,000 in proceeds from the issuance of Gulf Opportunity Zone tax-exempt bonds (GOZone Bonds) by the Louisiana Public Facilities Authority (the Authority) pursuant to a loan agreement between Dynamic Fuels and the Authority (Loan Agreement). The proceeds were used to construct the Dynamic Fuels production facility. In June 2014, as a result of the acquisitions of Syntroleum and Dynamic Fuels, the Loan Agreement related to the GOZone Bonds became part of the Company's consolidated long-term debt. The GOZone Bonds mature on October 1, 2033. Interest on the GOZone Bonds accrues at a daily rate, weekly rate, commercial paper rate or long term rate, as determined by REG Geismar. When the GOZone Bonds are in daily or weekly mode, at any time holders have the right to tender bonds for repurchase and bonds are subject to optional redemption by a remarketing agent pursuant to a remarketing agreement. The GOZone Bonds were in the weekly interest rate mode as of June 30, 2014 and the applicable interest rate at June 30, 2014 was 0.04% per annum.
	At the time that the GOZone Bonds were originally issued, Tyson Foods, one of the former equityholders of Dynamic Fuels, obtained an irrevocable direct-pay letter of credit (Old Letter of Credit) from a financial institution which was provided to the trustee for the GOZone Bonds and drawn upon to pay the principal of and interest on the GOZone Bonds and the portion of the purchase price attributable to principal of and interest on the GOZone Bonds in connection with any GOZone Bond repurchase obligations of Dynamic Fuels. In connection with the acquisition from Tyson Foods, the Company agreed to reimburse Tyson Foods for any amounts payable by Tyson in the event of a draw on the Old Letter of Credit, to replace the Old Letter of Credit or redeem or discharge the GOZone Bonds and to secure these obligations by the deposit of $101,315 into an escrow account for the benefit of Tyson, which represented the full amount of Tyson’s obligation under the Old Letter of Credit. The escrow funds are recorded as restricted cash in non-current assets of the Condensed Consolidated Balance Sheets.
	Revolving Line of Credit
		June 30, 2014		December 31, 2013
	Amount borrowed under revolving line of credit	$	19,825	$	10,986
	Maximum available to be borrowed under revolving line of credit	$	20,175	$	29,014

Related_Party_Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	RELATED PARTY TRANSACTIONS
	West Central Cooperative
	West Central beneficially owns more than 5% of our outstanding securities. The Company has several contractual relationships and transactions with West Central, including contracts for services, supply of soybean oil feedstock, a ground lease for the Ralston facility and an extended payment terms arrangement
	Under the ground lease with West Central, West Central leases the real property on which the Ralston facility is located for an annual rental fee of one dollar. The ground lease has a 20-year term ending July 31, 2026 and the Company may elect to extend the term for six additional five-year terms. The Company also has an Asset Use Agreement with West Central which provides for the use of certain assets, such as buildings, equipment and utilities, which will be charged to the Company based on fixed and variable components.
	The Company purchases once-refined soybean oil from West Central to supply the Ralston facility. On October 1, 2012, the Company entered into a new feedstock supply agreement with West Central. The supply agreement expired on January 31, 2014 with the option for a one year extension, which the Company extended. West Central agrees to supply and the Company agrees to purchase soybean oil for the Ralston facility at a price indexed to prevailing Chicago Board of Trade, or CBOT, soybean oil market prices with an agreed upon negotiated market basis.
	In June 2009, the Company entered into an extended payment terms agreement with West Central. The agreement set forth the terms of payment that apply for soybean oil that West Central sold to the Company for use at the Ralston facility, as well as any other feedstock that West Central agreed to sell. Pursuant to the agreement, payment for feedstocks delivered by West Central is required to be made within 45 days after delivery by West Central of an invoice for the feedstocks. Interest accrues on amounts due for feedstocks supplied by West Central beginning on the fifth day after West Central delivered an invoice for the feedstock until paid. At no time during the term of the agreement is the amount payable to West Central permitted to exceed $3,000. The agreement expires in January 2015 and automatically renews for one additional year unless either party provides sufficient notice of cancellation prior to the renewal.
	Summary of Related Party Balances - Condensed Consolidated Statements of Operations
		Three Months		Three Months		Six Months		Six Months
		Ended		Ended		Ended		Ended
		June 30,		June 30,		June 30,		June 30,
		2014		2013		2014		2013
	Cost of goods sold – Biodiesel	$	14,283	$	13,411	$	21,429	$	25,141
	Selling, general and administrative expenses	$	39	$	—	$	39	$	2
	Interest expense	$	1	$	8	$	1	$	28
	Summary of Related Party Balances - Condensed Consolidated Balance Sheets
		As of		As of
		June 30, 2014		December 31, 2013
	Accounts receivable	$	247	$	426
	Other assets	$	—	$	35
	Accounts payable	$	662	$	552

Derivative_Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments	'
	DERIVATIVE INSTRUMENTS
	The Company enters into heating oil and soybean oil futures, swaps and options (commodity contract derivatives) to hedge its exposure to price risk related to anticipated purchases of feedstock raw materials and to protect gross profit margins from potentially adverse effects of price volatility on biodiesel sales where prices are set at a future date. All of the Company’s commodity contract derivatives are designated as non-hedge derivatives and recorded at fair value on the Condensed Consolidated Balance Sheets. Unrealized gains and losses are recognized as a component of biodiesel costs of goods sold reflected in current results of operations. As of June 30, 2014, the Company had 1,501 open commodity contracts.
	The Company offsets the fair value amounts recognized for its commodity contract derivatives with cash collateral with the same counterparty under a master netting agreement. The net position is presented within prepaid and other assets in the Condensed Consolidated Balance Sheets. The following table sets forth the fair value of the Company's commodity contract derivatives and amounts that offset within the Condensed Consolidated Balance Sheets:
		30-Jun-14								31-Dec-13
		Assets				Liabilities				Assets				Liabilities
	Gross amounts of derivatives recognized at fair value	$	1,161			$	2,093			$	325			$	546
	Cash collateral	13,087				—				13,896				—
	Total gross amount recognized	14,248				2,093				14,221				546
	Gross amounts offset	(2,093		)		(2,093		)		(546		)		(546		)
	Net amount reported in the condensed consolidated balance sheet	$	12,155			$	—			$	13,675			$	—
	The following table sets forth the pre-tax gains (losses) included in the Condensed Consolidated Statement of Operations:
		Location of Gain (Loss)		Three Months				Three Months				Six Months				Six Months
		Recognized in income		Ended				Ended				Ended				Ended
				June 30,				June 30,				June 30,				June 30,
				2014				2013				2014				2013
	Commodity derivatives	Cost of goods sold – Biodiesel		$	(2,744	)		$	6,672			$	(3,438	)		$	8,039

Fair_Value_Measurement

Fair Value Measurement	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurement	'
	FAIR VALUE MEASUREMENT
	The fair value hierarchy prioritizes the inputs used in measuring fair value as follows:
	•	Level 1 — Quoted prices for identical instruments in active markets.
	•	Level 2 — Quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model-derived valuations, in which all significant inputs are observable in active markets.
	•	Level 3 — Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.
	A summary of assets (liabilities) measured at fair value is as follows:
		As of June 30, 2014
		Total			Level 1			Level 2			Level 3
	Money market funds	$	1,475		$	1,475		$	—		$	—
	Certificates of deposit	10,942			—			10,942			—
	Commercial paper	32,963			—			32,963			—
	Commercial notes/bonds	26,384			—			26,384			—
	Commodity contract derivatives	(932		)	—			(932		)	—
	Contingent consideration for LS9 acquisition	(16,666		)	—			—			(16,666		)
	Contingent consideration for Dynamic Fuels acquisition	(28,900		)	—			—			(28,900		)
		As of December 31, 2013
		Total			Level 1			Level 2			Level 3
	Commodity contract derivatives	$	(221	)	$	—		$	(221	)	$	—
	The following is a reconciliation of the beginning and ending balances for liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3):
		Contingent Consideration for LS9 Acquisition			Contingent Consideration for Dynamic Fuels Acquisition
	Beginning balance - January 1, 2014	$	—		$	—
	Fair value of contingent liability recorded at measurement date	17,050			—
	Ending balance - March 31, 2014	17,050			—
	Fair value of contingent liability recorded at measurement date	—			28,900
	Change in estimates included in earnings	(384		)	—
	Settlements	—			—
	Ending balance - June 30, 2014	$	16,666		$	28,900
	The estimated fair values of the Company’s financial instruments, which are not recorded at fair value, are as follows:
		As of June 30, 2014						As of December 31, 2013
		Asset (Liability)			Fair Value			Asset (Liability)			Fair Value
		Carrying						Carrying
		Amount						Amount
	Financial liabilities:
	Debt and lines of credit	$	(269,343	)	$	(270,503	)	$	(45,166	)	$	(45,094	)
	The carrying amounts reported in the Condensed Consolidated Balance Sheets for cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate their fair values. Money market funds are included in cash and cash equivalents on the Condensed Consolidated Balance Sheets.
	The Company used the following methods and assumptions to estimate fair value of its financial instruments:
	Marketable securities: The fair value of marketable securities are obtained using quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets in markets that are not active; and inputs other than quoted prices, e.g., interest rates and yield curves. The Company utilizes a pricing service to assist in obtaining fair value pricing for the majority of this investment portfolio.
	Commodity derivatives: The instruments held by the Company consist primarily of futures contracts, swap agreements, purchased put options and written call options. The fair value is determined based on quoted prices of similar contracts in over-the-counter markets and are reflected in Level 2.
	Contingent consideration for acquisitions: The fair value of the LS9 contingent consideration is determined using an expected present value technique. Expected cash flows are determined using the probability weighted-average of possible outcomes that would occur should achievement of certain milestones related to the development and commercialization of products from LS9’s technology occur. There is no observable market data available to use in valuing the contingent consideration; therefore, the Company developed its own assumptions related to the expected future delivery of product enhancements to estimate the fair value of these liabilities. An 8.0% discount rate is used to estimate the fair value of the expected payments.
	The fair value of the Dynamic Fuels contingent consideration is determined using an expected present value technique. Expected cash flows are determined using the probability weighted-average of possible outcomes that would occur should the achievement of certain milestones related to the sale of renewable diesel at the REG Geismar's production facility. A 5.8% discount rate is used to estimate the fair value of the expected payments.
	Debt and lines of credit: The fair value of long-term debt and lines of credit was established using discounted cash flow calculations and current market rates reflecting Level 2 inputs.

Net_Income_Per_Share

Net Income Per Share	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Net Income Per Share	'
	NET INCOME PER SHARE
	Basic net income per common share is presented in conformity with the two-class method required for participating securities. Participating securities include, or have included, Series B Preferred Stock and restricted stock unites (RSUs).
	Under the two-class method, net income is reduced for distributed and undistributed dividends earned in the current period. The remaining earnings are then allocated to Common Stock and the participating securities. The Company calculates the effects of participating securities on diluted earnings per share (EPS) using both the “if-converted or treasury stock” and "two-class" methods and discloses the method which results in a more dilutive effect. The effects of Common Stock options, warrants, stock appreciation rights and convertible notes on diluted EPS are calculated using the treasury stock method unless the effects are anti-dilutive to EPS.
	The following potentially dilutive weighted average securities were excluded from the calculation of diluted net income per share attributable to common stockholders during the periods presented as the effect was anti-dilutive:
		Three Months		Three Months			Six Months		Six Months
		Ended		Ended			Ended		Ended
		June 30,		June 30,			June 30,		June 30,
		2014		2013			2014		2013
	Options to purchase common stock	87,026		87,026			87,026		87,026
	Restricted stock units	—		524,417			—		514,596
	Stock appreciation rights	1,129,018		1,225,528			1,389,189		1,149,877
	Warrants to purchase common stock	17,916		—			17,916		17,916
	Convertible notes	5,419,109		—			5,419,109		—
	Total	6,653,069		1,836,971			6,913,240		1,769,415
	The following table presents the calculation of diluted net income per share:
		Three Months			Three Months			Six Months			Six Months
		Ended			Ended			Ended			Ended
		June 30,			June 30,			June 30,			June 30,
		2014			2013			2014			2013
	Net income attributable to the Company’s common stockholders - Basic	$	10,835		$	19,573		$	8,858		$	58,007
	Plus: change in undistributed dividends allocated to preferred stockholders	—			(839		)	—			—
	Plus: distributed dividends to Preferred Stockholders	—			1,590			40			1,590
	Plus (Less): effect of participating securities	—			2,480			(406		)	8,979
	Net income available to common stockholders - Dilutive	$	10,835		$	22,804		$	8,492		$	68,576
	Shares:
	Weighted-average shares used to compute basic net income per share	39,939,346			31,292,910			39,119,430			30,967,903
	Adjustment to reflect conversion of preferred stock	—			5,390,042			—			5,688,055
	Adjustment to reflect warrants to purchase common stock	—			812			—			—
	Adjustment to reflect stock appreciation right conversions	15,241			—			9,706			—
	Weighted-average shares used to compute diluted net income per share	39,954,587			36,683,764			39,129,136			36,655,958
	Net income per share attributable to common stockholders:
	Diluted	$	0.27		$	0.62		$	0.22		$	1.87

Reportable_Segments

Reportable Segments	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Reportable Segments	'
	REPORTABLE SEGMENTS
	The Company reports its reportable segments based on products and services provided to customers, which include Biodiesel, Services and Corporate and other. The accounting policies of the segments are the same as those described in the summary of significant accounting policies. The Company has chosen to differentiate the reportable segments based on the products and services each segment offers.
	The Biodiesel segment processes waste vegetable oils, animal fats, virgin vegetable oils and other feedstocks and methanol into biomass-based diesel. The Biodiesel segment also includes the Company’s purchases and resale of biomass-based diesel produced by third parties. Revenue is derived from the purchases and sales of biomass-based diesel and raw material feedstocks acquired from third parties, sales of biomass-based diesel produced under toll manufacturing arrangements with third party facilities, sales of processed biomass-based diesel from Company facilities, sales of RINs, related by-products and renewable energy government incentive payments. The Services segment offers services for managing the construction of biomass-based diesel production facilities and managing ongoing operations of internal and third party plants and collects fees related to the services provided. The Company does not allocate items that are of a non-operating nature or corporate expenses to the business segments. Intersegment revenues are reported by the Services segment, which manages the construction and operations of facilities included in the Biodiesel segment. Revenues are recorded by the Services segment at cost. Corporate expenses consist of corporate office expenses including compensation, benefits, occupancy and other administrative costs, including management service expenses.
	The following table represents the significant items by reportable segment:
		Three Months			Three Months			Six Months			Six Months
		Ended			Ended			Ended			Ended
		June 30,			June 30,			June 30,			June 30,
		2014			2013			2014			2013
	Net revenues:
	Biodiesel	$	332,859		$	384,688		$	551,871		$	649,014
	Services	26,066			28,913			46,590			15,100
	Intersegment revenues	(26,007		)	(28,866		)	(46,503		)	(15,011		)
		$	332,918		$	384,735		$	551,958		$	649,103
	Income (loss) before income taxes:
	Biodiesel	$	15,114		$	50,203		$	26,675		$	136,916
	Services	37			(22		)	40			(40		)
	Corporate and other (a)	(16,063		)	(11,737		)	(30,093		)	(21,840		)
		$	(912	)	$	38,444		$	(3,378	)	$	115,036
	Depreciation and amortization expense, net:
	Biodiesel	$	2,836		$	1,915		$	5,425		$	3,640
	Services	52			32			93			51
	Corporate and other (a)	268			228			521			432
		$	3,156		$	2,175		$	6,039		$	4,123
	Cash paid for purchases of property, plant and equipment:
	Biodiesel	$	18,352		$	8,486		$	30,906		$	18,210
	Services	631			375			631			474
	Corporate and other (a)	554			1,273			773			1,373
		$	19,537		$	10,134		$	32,310		$	20,057
		As of			As of
		June 30, 2014			December 31, 2013
	Assets:
	Biodiesel	$	815,256		$	444,945
	Services	21,079			20,542
	Corporate and other (b)	232,761			275,368
		$	1,069,096		$	740,855
	(a)	Corporate and other includes income/(expense) not associated with the reportable segments, such as corporate general and administrative expenses, shared service expenses, interest expense and interest income.
	(b)	Corporate and other includes cash and other assets not associated with the reportable segments, including investments.

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	COMMITMENTS AND CONTINGENCIES
	The Company is involved in legal proceedings in the normal course of business. The Company currently believes that any ultimate liability arising out of such proceedings will not have a material adverse effect on the Company’s financial position, results of operations or cash flows.
	The Company has entered into contracts for supplies of hydrogen, nitrogen and utilities for the REG Geismar production facility. The following table outlines the minimum take or pay requirement related to the purchase of hydrogen, nitrogen and utilities.
	July 1, 2014 through December 31, 2014	$	1,874
	2015	3,748
	2016	3,748
	2017	3,748
	2018	3,748
	2019 and thereafter	19,590
	Total	$	36,456
	As of June 30, 2014, REG Geismar relies on one supplier to provide hydrogen necessary to execute the production process. Any disruptions to the hydrogen supply from this supplier will result in the shutdown of the REG Geismar plant operations. The Company is currently exploring alternatives to ensure reliability of hydrogen supply for the REG Geismar facility.

Subsequent_Events

Subsequent Events	6 Months Ended
	Jun. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	SUBSEQUENT EVENTS
	On July 8, 2014, REG Geismar (formerly named Dynamic Fuels, LLC) and Bank of America, N.A. (Bank of America) entered into a Reimbursement Agreement, dated as of the same date (Reimbursement Agreement), and Bank of America issued a letter of credit (Substitute Letter of Credit) to the trustee for the GOZone Bonds, in substitution for the irrevocable direct-pay letter of credit (Old Letter of Credit) held by Tyson Foods. The Substitute Letter of Credit is in the stated amount of $101,315, which represents the sum of the outstanding $100,000 principal amount of the GOZone Bonds plus $1,315 of interest. The Substitute Letter of Credit expires on July 8, 2015. In the event that the expiration date of the Substitute Letter of Credit is not extended or a new letter of credit is not issued in substitution for the Substitute Letter of Credit, holders of the Bonds are required to tender their Bonds for repurchase and the trustee for the Bonds is required pursuant to the terms of the indenture governing the Bonds to draw down the Substitute Letter of Credit to fund the repurchase of the Bonds. The Substitute Letter of Credit requires that the Bonds remain in the daily or weekly interest rate mode.
	REG Geismar’s repayment obligations under the Reimbursement Agreement are secured by $101,315 held in an escrow account by REG Capital, LLC (REG Capital), another wholly-owned subsidiary of the Company, which was pledged by REG Capital to Bank of America. Other than this escrow account, REG Geismar's obligations under the Reimbursement Agreement are not guaranteed by the Company or any of its affiliates.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Restricted Cash	'
	Restricted Cash
	Restricted cash consists of funds that are held in an escrow account totaling $101,315 and $0 as of June 30, 2014 and December 31, 2013, respectively, which have been restricted in accordance with the terms of the escrow account for the benefit of Tyson Foods in connection with our acquisition of Dynamic Fuels. For additional information, see Note 9 - Debt. The Company classifies restricted cash between current and non-current assets based on the length of time of the restricted use.
Marketable Securities	'
	Marketable Securities
	The Company’s marketable securities are classified as available-for-sale and are reported at fair value, with unrealized gains and losses, net of tax, recorded in accumulated other comprehensive income (loss). Realized gains or losses and declines in value judged to be other-than-temporary, if any, on available-for-sale securities are reported in other income, net. The Company evaluates the investments periodically for possible other-than-temporary impairment. A decline of fair value below amortized costs of debt securities is considered an other-than-temporary impairment if the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of the entire amortized cost basis. In those instances, an impairment charge equal to the difference between the fair value and the amortized cost basis is recognized in earnings. Regardless of the Company’s intent or requirement to sell a debt security, an impairment is considered other-than-temporary if the Company does not expect to recover the entire amortized cost basis; in those instances, a credit loss equal to the difference between the present value of the cash flows expected to be collected based on credit risk and the amortized cost basis of the debt security is recognized in earnings. The Company has no current requirement or intent to sell a material portion of marketable securities as of June 30, 2014. The Company expects to recover up to (or beyond) the initial cost of investment for securities held. In computing realized gains and losses on available-for-sale securities, the Company determines cost based on amounts paid, including direct costs such as commissions to acquire the security, using the specific identification method. There were no gross realized gains and losses on available-for-sale securities during the three and six months ended June 30, 2014 and 2013, respectively.
Contingent Consideration for Acquisitions	'
	Contingent Consideration for Acquisitions
	Contingent considerations in a purchase business combination are established at the time of the acquisition (See Note 3 - Acquisitions). The contingent consideration is adjusted to fair value at each reporting period. The change in fair value is included in change in fair value of contingent consideration on the Condensed Consolidated Statements of Operations.
Research and Development Costs	'
	Research and Development Costs
	Research and development (R&D) costs are charged to expense as incurred. R&D expense was $3,217 and $5,090 for the three and six months ended June 30, 2014, respectively, and $14 and $74 for the three and six months ended June 30, 2013, respectively. In process research and development (IPR&D) assets acquired in connection with acquisitions (if applicable) are recorded on the Condensed Consolidated Balance Sheets as intangible assets. Acquired IPR&D is initially assigned an indefinite life and is subject to impairment testing until the completion or abandonment of the associated R&D efforts. If abandoned, the carrying value of the IPR&D asset is expensed. Once the associated R&D efforts are completed, the carrying value of the IPR&D is reclassified as a finite-lived asset and is amortized over its useful life.
Convertible Debt	'
	Convertible Debt
	In June 2014, the Company issued $143,750 in convertible senior notes. Applicable authoritative accounting guidance requires that the conversion feature be assigned a fair value and that feature reduce the initial recorded value of the liability component of the convertible senior notes. This conversion feature is recorded in equity on a net of tax basis. The discount on the liability component is being amortized through interest expense until the maturity date of June 15, 2019. See "Note 9 - Debt" for a further description of the transaction.
Capped Call Transaction	'
	Capped Call Transaction
	In connection with the issuance of the convertible senior notes, the Company entered into capped call transactions. The purchased capped call transactions were recorded as a reduction to common stock-additional paid-in-capital. Because this was considered to be an equity transaction and qualifies for the derivative scope exception, no future changes in the fair value of the capped call will be recorded by the Company.
Income Taxes	'
	Income Taxes
	The change in the valuation allowance for the three and six months ended June 30, 2014 was mainly attributable to the acquisition of Syntroleum and Dynamic Fuels. Specifically, in connection with the acquisition of Syntroleum and Dynamic Fuels, the Company acquired a net deferred tax liability of $7,278 that will produce future taxable income. The increase in the gross deferred tax liability results in a reduction to the Company's valuation allowance which has been recognized as a tax benefit discretely in the current quarter.
	Under the rules prescribed by Internal Revenue Code (IRC) Section 382 and applicable regulations, if certain transactions occur with respect to an entity's capital stock that result in a cumulative ownership shift of more than 50 percentage points by 5% stockholders over a testing period, annual limitations are imposed with respect to the entity's ability to utilize its net operating loss carryforwards. During the six months ended June 30, 2014, the Company recorded an increase to the deferred tax assets for net operating loss carryforwards from Syntroleum of approximately $22,600 on a pre-tax basis (after IRC Section 382 limitation). IRC Section 382 limits the Company's ability to realize these net operating losses, which begin to expire in 2018 and are fully offset by a valuation allowance. The Company has not completed its accounting for the business combinations related to the Syntroleum and Dynamic Fuels acquisitions, and we continue to assess the recognition, measurement, and realizability of these deferred tax assets, and any changes thereto will be recorded in the accounting for the business combination.
New Accounting Pronouncements	'
	New Accounting Standards
	In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers: Summary and Amendments that Create Revenue from Contracts with Customers and Other Assets and Deferred Costs—Contracts with Customers. The guidance in this update supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition, and most industry-specific guidance throughout the industry topics of the codification. For public companies, this update will be effective for interim and annual periods beginning after December 15, 2016. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements, but does not expect the guidance to have a material impact on the Company's consolidated financial statements.

Acquisitions_Tables

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Schedule of Business Acquisitions	'
		June 6, 2014
	Consideration at fair value for Dynamic Fuels:
	Cash	$	16,447
	Contingent consideration	28,900
	Total	$	45,347
	The following table summarizes the amount of assets acquired and liabilities assumed at the acquisition date for the combined acquisition of Syntroleum and Dynamic Fuels:
		6-Jun-14
	Assets (liabilities) acquired of Syntroleum and Dynamic Fuels:
	Cash	$	253
	Other current assets	4,666
	Property, plant and equipment	122,827
	Goodwill	55,762
	Intangible assets	8,900
	Other noncurrent assets	10,281
	Other current liabilities	(1,180		)
	Deferred tax liabilities	(7,278		)
	Debt	(113,553		)
	Other noncurrent liabilities	(500		)
	Total	$	80,178
	The following table summarizes the consideration paid for Syntroleum.
		June 3, 2014
	Consideration at fair value for Syntroleum:
	Common stock	$	34,831
	The following table summarizes the consideration paid for LS9 and the amounts of assets acquired and liabilities assumed at the acquisition date:
		January 22, 2014
	Consideration at fair value:
	Cash	$	15,275
	Common stock	26,254
	Contingent consideration	17,050
	Total	$	58,579
		22-Jan-14
	Assets (liabilities) acquired:
	Property, plant and equipment	$	8,215
	In-process research & development intangible assets	15,956
	Goodwill	34,846
	Other noncurrent liabilities	(438		)
	Total	$	58,579
Acquisition, Pro Forma Information	'
	The following pro forma condensed combined results of operations assume that LS9, Syntroleum and Dynamic Fuels acquisitions were completed as of January 1, 2013:
		Three Months			Three Months		Six Months			Six Months
		Ended			Ended		Ended			Ended
		June 30,			June 30,		June 30,			June 30,
		2014			2013		2014			2013
	Revenue	$	333,099		$	385,451	$	552,501		$	677,229
	Net income	5,120			12,123		(6,735		)	65,752
	Basic net income (loss) per share	$	0.12		$	0.33	$	(0.16	)	$	1.79

Marketable_Securities_Tables

Marketable Securities (Tables)	6 Months Ended
	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Marketable Securities	'
	The Company's investments in marketable securities are stated at fair value and are available-for-sale. The following table summarizes the Company's marketable securities:
		As of June 30, 2014
		Maturity	Gross Amortized Cost		Fair Value		Total Unrealized Gains		Total Unrealized Losses
	Commercial paper	Within one year	$	32,958	$	32,963	$	5	$	—
	Corporate bonds	Within one year	26,393		26,384		—		(9		)
	Certificates of deposit	Within one year	10,960		10,942		—		(18		)
	Total		$	70,311	$	70,289	$	5	$	(27	)

Inventories_Tables

Inventories (Tables)	6 Months Ended
	Jun. 30, 2014
Inventory Disclosure [Abstract]	'
Inventories	'
	Inventories consist of the following:
		30-Jun-14		31-Dec-13
	Raw materials	$	21,412	$	13,393
	Work in process	1,925		1,456
	Finished goods	46,814		70,965
	Total	$	70,151	$	85,814

Prepaid_Expenses_and_Other_Ass1

Prepaid Expenses and Other Assets (Tables)	6 Months Ended
	Jun. 30, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]	'
Summary of Prepaid Expense and Other Assets	'
	Prepaid expense and other assets consist of the following:
		30-Jun-14		31-Dec-13
	Commodity derivatives and related collateral, net	$	12,155	$	13,675
	Prepaid expenses	4,294		2,414
	Deposits	4,326		293
	RIN inventory	16,649		6,455
	Income taxes receivable	1,328		2,197
	Other	1,550		534
	Total	$	40,302	$	25,568
Summary of other noncurrent assets	'
	Other noncurrent assets consist of the following:
		June 30, 2014		December 31, 2013
	Investments	$	7,368	$	7,351
	Debt issuance costs (net of accumulated amortization of $728 and $715, respectively)	4,974		832
	Spare parts inventory	3,671		3,671
	Deposits	3,780		—
	Other	6,944		526
	Total	$	26,737	$	12,380

Goodwill_Tables

Goodwill (Tables)	6 Months Ended
	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Carrying amount of goodwill	'
	The following table shows the carrying amount of goodwill by reportable segment as of December 31, 2013 and the changes in goodwill for the six months ended June 30, 2014:
		Biodiesel		Services		Total
	Balance, December 31, 2013	$	68,784	$	16,080	$	84,864
	Acquisitions	90,608		—		90,608
	Balance, June 30, 2014	$	159,392	$	16,080	$	175,472

Intangible_Assets_Tables

Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Components of Intangible assets	'
	Intangible assets consist of the following:
		30-Jun-14
		Cost		Accumulated Amortization			Net		Weighted Average Remaining Life
	Raw material supply agreement	$	5,708	$	(922	)	$	4,786	11.5 years
	Renewable diesel technology	8,300		—			8,300		15.0 years
	Trademarks	600		—			600		15.0 years
	Ground lease	200		(89		)	111		7.4 years
	Total amortizing intangibles	14,808		(1,011		)	13,797
	In-process research and development, indefinite lives	15,956		—			15,956
	Total intangible assets	$	30,764	$	(1,011	)	$	29,753
		31-Dec-13
		Cost		Accumulated Amortization			Net		Weighted Average Remaining Life
	Raw material supply agreement	$	5,502	$	(753	)	$	4,749	12.0 years
	Ground lease	200		(82		)	118		7.9 years
	Total amortizing intangibles	5,702		(835		)	4,867
	In-process research and development, indefinite lives	—		—			—
	Total intangible assets	$	5,702	$	(835	)	$	4,867
Estimated amortization expense	'
	The estimated intangible asset amortization expense for fiscal year 2014 through fiscal year 2018 and thereafter is as follows:
	July 1, 2014 through December 31, 2014	$	561
	2015	1,068
	2016	1,082
	2017	1,096
	2018	1,111
	2019 and thereafter	8,879
	Total	$	13,797

Debt_Tables

Debt (Tables)	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Company's Borrowings	'
	The Company’s debt is as follows:
		30-Jun-14		31-Dec-13
	Convertible debt	$	119,070	$	—
	REG Geismar GOZone bonds	100,000		—
	REG Danville term loan	3,525		5,626
	REG Newton term loan	16,880		18,143
	REG Mason City term loan	4,923		5,135
	Other	1,239		1,247
	Total debt	$	245,637	$	30,151
	Bell, LLC promissory note—variable interest entity	$	3,881	$	4,029
Revolving Line of Credit	'
	Revolving Line of Credit
		June 30, 2014		December 31, 2013
	Amount borrowed under revolving line of credit	$	19,825	$	10,986
	Maximum available to be borrowed under revolving line of credit	$	20,175	$	29,014

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2014
Related Party Transactions [Abstract]	'
Summary of Related Party Transactions	'
	Summary of Related Party Balances - Condensed Consolidated Statements of Operations
		Three Months		Three Months		Six Months		Six Months
		Ended		Ended		Ended		Ended
		June 30,		June 30,		June 30,		June 30,
		2014		2013		2014		2013
	Cost of goods sold – Biodiesel	$	14,283	$	13,411	$	21,429	$	25,141
	Selling, general and administrative expenses	$	39	$	—	$	39	$	2
	Interest expense	$	1	$	8	$	1	$	28
Summary of Related Party Balances	'
	Summary of Related Party Balances - Condensed Consolidated Balance Sheets
		As of		As of
		June 30, 2014		December 31, 2013
	Accounts receivable	$	247	$	426
	Other assets	$	—	$	35
	Accounts payable	$	662	$	552

Derivative_Instruments_Tables

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Summary of Derivative Financial Instruments by Balance Sheet Location	'
	The following table sets forth the fair value of the Company's commodity contract derivatives and amounts that offset within the Condensed Consolidated Balance Sheets:
		30-Jun-14								31-Dec-13
		Assets				Liabilities				Assets				Liabilities
	Gross amounts of derivatives recognized at fair value	$	1,161			$	2,093			$	325			$	546
	Cash collateral	13,087				—				13,896				—
	Total gross amount recognized	14,248				2,093				14,221				546
	Gross amounts offset	(2,093		)		(2,093		)		(546		)		(546		)
	Net amount reported in the condensed consolidated balance sheet	$	12,155			$	—			$	13,675			$	—
Summary of Derivative Financial Instruments by Location of Gain (Loss)	'
	The following table sets forth the pre-tax gains (losses) included in the Condensed Consolidated Statement of Operations:
		Location of Gain (Loss)		Three Months				Three Months				Six Months				Six Months
		Recognized in income		Ended				Ended				Ended				Ended
				June 30,				June 30,				June 30,				June 30,
				2014				2013				2014				2013
	Commodity derivatives	Cost of goods sold – Biodiesel		$	(2,744	)		$	6,672			$	(3,438	)		$	8,039

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Assets (Liabilities) Measured at Fair Value	'
	A summary of assets (liabilities) measured at fair value is as follows:
		As of June 30, 2014
		Total			Level 1			Level 2			Level 3
	Money market funds	$	1,475		$	1,475		$	—		$	—
	Certificates of deposit	10,942			—			10,942			—
	Commercial paper	32,963			—			32,963			—
	Commercial notes/bonds	26,384			—			26,384			—
	Commodity contract derivatives	(932		)	—			(932		)	—
	Contingent consideration for LS9 acquisition	(16,666		)	—			—			(16,666		)
	Contingent consideration for Dynamic Fuels acquisition	(28,900		)	—			—			(28,900		)
		As of December 31, 2013
		Total			Level 1			Level 2			Level 3
	Commodity contract derivatives	$	(221	)	$	—		$	(221	)	$	—
Liabilities Measured at Fair Value on a Recurring Basis	'
	The following is a reconciliation of the beginning and ending balances for liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3):
		Contingent Consideration for LS9 Acquisition			Contingent Consideration for Dynamic Fuels Acquisition
	Beginning balance - January 1, 2014	$	—		$	—
	Fair value of contingent liability recorded at measurement date	17,050			—
	Ending balance - March 31, 2014	17,050			—
	Fair value of contingent liability recorded at measurement date	—			28,900
	Change in estimates included in earnings	(384		)	—
	Settlements	—			—
	Ending balance - June 30, 2014	$	16,666		$	28,900
Estimated Fair Values of the Company's Financial Instruments	'
	The estimated fair values of the Company’s financial instruments, which are not recorded at fair value, are as follows:
		As of June 30, 2014						As of December 31, 2013
		Asset (Liability)			Fair Value			Asset (Liability)			Fair Value
		Carrying						Carrying
		Amount						Amount
	Financial liabilities:
	Debt and lines of credit	$	(269,343	)	$	(270,503	)	$	(45,166	)	$	(45,094	)

Net_Income_Per_Share_Tables

Net Income Per Share (Tables)	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Dilutive weighted average securities were excluded from the calculation of diluted net income (loss) per share attributable to common stockholders during the periods	'
	The following potentially dilutive weighted average securities were excluded from the calculation of diluted net income per share attributable to common stockholders during the periods presented as the effect was anti-dilutive:
		Three Months		Three Months			Six Months		Six Months
		Ended		Ended			Ended		Ended
		June 30,		June 30,			June 30,		June 30,
		2014		2013			2014		2013
	Options to purchase common stock	87,026		87,026			87,026		87,026
	Restricted stock units	—		524,417			—		514,596
	Stock appreciation rights	1,129,018		1,225,528			1,389,189		1,149,877
	Warrants to purchase common stock	17,916		—			17,916		17,916
	Convertible notes	5,419,109		—			5,419,109		—
	Total	6,653,069		1,836,971			6,913,240		1,769,415
Calculation of diluted net income per share	'
	The following table presents the calculation of diluted net income per share:
		Three Months			Three Months			Six Months			Six Months
		Ended			Ended			Ended			Ended
		June 30,			June 30,			June 30,			June 30,
		2014			2013			2014			2013
	Net income attributable to the Company’s common stockholders - Basic	$	10,835		$	19,573		$	8,858		$	58,007
	Plus: change in undistributed dividends allocated to preferred stockholders	—			(839		)	—			—
	Plus: distributed dividends to Preferred Stockholders	—			1,590			40			1,590
	Plus (Less): effect of participating securities	—			2,480			(406		)	8,979
	Net income available to common stockholders - Dilutive	$	10,835		$	22,804		$	8,492		$	68,576
	Shares:
	Weighted-average shares used to compute basic net income per share	39,939,346			31,292,910			39,119,430			30,967,903
	Adjustment to reflect conversion of preferred stock	—			5,390,042			—			5,688,055
	Adjustment to reflect warrants to purchase common stock	—			812			—			—
	Adjustment to reflect stock appreciation right conversions	15,241			—			9,706			—
	Weighted-average shares used to compute diluted net income per share	39,954,587			36,683,764			39,129,136			36,655,958
	Net income per share attributable to common stockholders:
	Diluted	$	0.27		$	0.62		$	0.22		$	1.87

Reportable_Segments_Tables

Reportable Segments (Tables)	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Segment for the Results of Operations	'
	The following table represents the significant items by reportable segment:
		Three Months			Three Months			Six Months			Six Months
		Ended			Ended			Ended			Ended
		June 30,			June 30,			June 30,			June 30,
		2014			2013			2014			2013
	Net revenues:
	Biodiesel	$	332,859		$	384,688		$	551,871		$	649,014
	Services	26,066			28,913			46,590			15,100
	Intersegment revenues	(26,007		)	(28,866		)	(46,503		)	(15,011		)
		$	332,918		$	384,735		$	551,958		$	649,103
	Income (loss) before income taxes:
	Biodiesel	$	15,114		$	50,203		$	26,675		$	136,916
	Services	37			(22		)	40			(40		)
	Corporate and other (a)	(16,063		)	(11,737		)	(30,093		)	(21,840		)
		$	(912	)	$	38,444		$	(3,378	)	$	115,036
	Depreciation and amortization expense, net:
	Biodiesel	$	2,836		$	1,915		$	5,425		$	3,640
	Services	52			32			93			51
	Corporate and other (a)	268			228			521			432
		$	3,156		$	2,175		$	6,039		$	4,123
	Cash paid for purchases of property, plant and equipment:
	Biodiesel	$	18,352		$	8,486		$	30,906		$	18,210
	Services	631			375			631			474
	Corporate and other (a)	554			1,273			773			1,373
		$	19,537		$	10,134		$	32,310		$	20,057
		As of			As of
		June 30, 2014			December 31, 2013
	Assets:
	Biodiesel	$	815,256		$	444,945
	Services	21,079			20,542
	Corporate and other (b)	232,761			275,368
		$	1,069,096		$	740,855
	(a)	Corporate and other includes income/(expense) not associated with the reportable segments, such as corporate general and administrative expenses, shared service expenses, interest expense and interest income.
	(b)	Corporate and other includes cash and other assets not associated with the reportable segments, including investments.

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Contractual Obligation, Fiscal Year Maturity Schedule	'
	The following table outlines the minimum take or pay requirement related to the purchase of hydrogen, nitrogen and utilities.
	July 1, 2014 through December 31, 2014	$	1,874
	2015	3,748
	2016	3,748
	2017	3,748
	2018	3,748
	2019 and thereafter	19,590
	Total	$	36,456

Basis_of_Presentation_and_Natu1

Basis of Presentation and Nature of the Business (Details) (Syntroleum Corporation, Dynamic Fuels, LLC)	0 Months Ended
	Jun. 06, 2014	Jun. 03, 2014
		gal
Syntroleum Corporation | Dynamic Fuels, LLC	'	'
Business Acquisition [Line Items]	'	'
Equity interest	50.00%	50.00%
Production Capacity Per Year	'	75,000,000

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Details Textual) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Accounting Policies [Abstract]	'	'	'	'	'
Restricted cash	$101,315	'	$101,315	'	$0
Research and Development Expense	3,217	14	5,090	74	'
Convertible senior notes	143,750	'	143,750	'	'
Syntroleum Corporation and Dynamic Fuels, LLC	'	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'	'
Net deferred tax liability	7,278	'	7,278	'	'
Syntroleum Corporation	'	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'	'
Net operating loss carryforward	$22,600	'	$22,600	'	'

Acquisitions_Details

Acquisitions (Details) (USD $)	6 Months Ended		1 Months Ended		0 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jan. 22, 2014	Jun. 30, 2014	Jun. 03, 2014	Jun. 06, 2014	Jun. 30, 2014	Jun. 06, 2014
			LS9, Inc.	LS9, Inc.	Syntroleum Corporation	Dynamic Fuels, LLC	Syntroleum Corporation and Dynamic Fuels, LLC	Syntroleum Corporation and Dynamic Fuels, LLC
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'
Cash	'	'	$15,275	'	'	$16,447	'	'
Common stock	61,085	'	26,254	'	34,831	'	'	'
Contingent consideration	40,470	0	17,050	16,666	'	28,900	28,900	'
Total	'	'	58,579	'	'	45,347	'	'
Assets (liabilities) acquired:	'	'	'	'	'	'	'	'
Cash	'	'	'	'	'	'	'	253
Other current assets	'	'	'	'	'	'	'	4,666
Property, plant and equipment	'	'	8,215	'	'	'	'	122,827
Intangible assets	'	'	15,956	'	'	'	'	8,900
Goodwill	175,472	84,864	34,846	'	'	'	'	55,762
Other noncurrent assets	'	'	'	'	'	'	'	10,281
Other current liabilities	'	'	'	'	'	'	'	-1,180
Deferred tax liabilities	'	'	'	'	'	'	'	-7,278
Debt	-113,553	'	'	'	'	'	'	-113,553
Other noncurrent liabilities	'	'	438	'	'	'	'	500
Total	'	'	$58,579	'	'	'	'	$80,178

Acquisitions_Details_Textual

Acquisitions (Details Textual) (USD $)

3 Months Ended

6 Months Ended

1 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

6 Months Ended

0 Months Ended

0 Months Ended

In Thousands, except Share data, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jan. 22, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 03, 2014

Jun. 30, 2014

Jun. 06, 2014

Jun. 30, 2014

Jun. 06, 2014

Jun. 06, 2014

Jun. 03, 2014

Tyson Foods

LS9, Inc.

LS9, Inc.

LS9, Inc.

Syntroleum Corporation

Syntroleum Corporation

Syntroleum Corporation and Dynamic Fuels, LLC

Syntroleum Corporation and Dynamic Fuels, LLC

Syntroleum Corporation and Dynamic Fuels, LLC

Dynamic Fuels, LLC

Dynamic Fuels, LLC

Tyson Foods

Syntroleum Corporation

Syntroleum Corporation

gal

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayments of Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

$13,553

'

'

Shares of common stock issued

'

'

'

'

'

'

2,230,559

'

'

3,493,613

'

'

'

'

'

'

Fair Value Inputs, Discount Rate

'

'

'

'

'

'

'

'

8.00%

'

5.80%

'

'

'

'

'

LS9 Earnout Payments

'

'

'

'

'

'

21,500

'

'

'

'

'

'

'

'

'

LS9 Earnout Payment, Period

'

'

'

'

'

'

'5 years

'

'

'

'

'

'

'

'

'

Net loss

-11,007

-23,130

-8,648

-69,533

'

'

'

2,822

4,663

'

'

-4,850

'

'

'

'

Equity interest

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

50.00%

Production Capacity Per Year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

75,000,000

Contingent consideration

40,470

'

40,470

'

0

35,000

17,050

16,666

16,666

'

'

'

28,900

'

'

'

Contingent liability, current

'

'

'

'

'

'

'

'

'

'

'

'

5,096

'

'

'

Revenue

332,918

384,735

551,958

649,103

'

'

'

'

'

'

'

50

'

'

'

'

Income Tax Expense (Benefit)

($11,919)

$15,314

($12,026)

$45,503

'

'

'

'

'

'

'

($3,301)

'

'

'

'

Acquisitions_Details_1

Acquisitions (Details 1) (Syntroleum Corporation and Dynamic Fuels, LLC, USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Syntroleum Corporation and Dynamic Fuels, LLC	'	'	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'	'	'
Revenue	$333,099	$385,451	$552,501	$677,229
Net income	$5,120	$12,123	($6,735)	$65,752
Basic net income (loss) per share	$0.12	$0.33	($0.16)	$1.79

Marketable_Securities_Details

Marketable Securities (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Gross Amortized Cost	$70,311	'
Fair Value	70,289	0
Total Unrealized Gains	5	'
Total Unrealized Losses	-27	'
Commercial paper	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Gross Amortized Cost	32,958	'
Fair Value	32,963	'
Total Unrealized Gains	5	'
Total Unrealized Losses	0	'
Corporate bonds	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Gross Amortized Cost	26,393	'
Fair Value	26,384	'
Total Unrealized Gains	0	'
Total Unrealized Losses	-9	'
Certificates of deposit	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Gross Amortized Cost	10,960	'
Fair Value	10,942	'
Total Unrealized Gains	0	'
Total Unrealized Losses	($18)	'

Inventories_Details

Inventories (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventories	'	'
Raw materials	$21,412	$13,393
Work in process	1,925	1,456
Finished goods	46,814	70,965
Total	$70,151	$85,814

Prepaid_Expenses_and_Other_Ass2

Prepaid Expenses and Other Assets (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Summary of prepaid expense and other assets	'	'
Commodity derivatives and related collateral, net	$12,155	$13,675
Prepaid expenses	4,294	2,414
Deposits	4,326	293
RIN inventory	16,649	6,455
Income taxes receivable	1,328	2,197
Other	1,550	534
Total	$40,302	$25,568

Prepaid_Expenses_and_Other_Ass3

Prepaid Expenses and Other Assets (Details Textual) (USD $)	6 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Other Assets [Abstract]	'	'
Inventory reduced to lower of cost or market	$192	$1,277
Accumulated amortization, debt issuance costs	$728	$715

Prepaid_Expenses_and_Other_Ass4

Prepaid Expenses and Other Assets (Other Noncurrent Assets) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]	'	'
Investments	$7,368	$7,351
Debt issuance costs (net of accumulated amortization of $728 and $715, respectively)	4,974	832
Spare parts inventory	3,671	3,671
Deposits	3,780	0
Other	6,944	526
Total	$26,737	$12,380

Goodwill_Details

Goodwill (Details) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014
Goodwill [Roll Forward]	'
Balance	$84,864
Acquisitions	90,608
Balance	175,472
Biodiesel	'
Goodwill [Roll Forward]	'
Balance	68,784
Acquisitions	90,608
Balance	159,392
Services	'
Goodwill [Roll Forward]	'
Balance	16,080
Acquisitions	0
Balance	$16,080

Intangible_Assets_Details

Intangible Assets (Details) (USD $)	6 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]	'	'
Cost, finite-lived	$14,808	$5,702
Accumulated Amortization, finite-lived	-1,011	-835
Total	13,797	4,867
Cost, indefinite lived	30,764	5,702
Accumulated Amortization, indefinite-lived	-1,011	-835
Net, indefinite-lived	29,753	4,867
In-process research and development, indefinite lives	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Cost, indefinite lived	15,956	0
Accumulated Amortization, indefinite-lived	0	0
Net, indefinite-lived	15,956	0
Raw material supply agreement	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Cost, finite-lived	5,708	5,502
Accumulated Amortization, finite-lived	-922	-753
Total	4,786	4,749
Weighted Average Remaining Life	'11 years 6 months	'12 years
Renewable diesel technology	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Cost, finite-lived	8,300	'
Accumulated Amortization, finite-lived	0	'
Total	8,300	'
Weighted Average Remaining Life	'15 years	'
Trademarks	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Cost, finite-lived	600	'
Accumulated Amortization, finite-lived	0	'
Total	600	'
Weighted Average Remaining Life	'15 years	'
Ground lease	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Cost, finite-lived	200	200
Accumulated Amortization, finite-lived	-89	-82
Total	$111	$118
Weighted Average Remaining Life	'7 years 4 months 24 days	'7 years 10 months 24 days

Intangible_Assets_Details_1

Intangible Assets (Details 1) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Estimated amortization expense	'	'
July 1, 2014 through December 31, 2014	$561	'
2015	1,068	'
2016	1,082	'
2017	1,096	'
2018	1,111	'
2019 and thereafter	8,879	'
Total	$13,797	$4,867

Intangible_Assets_Details_Text

Intangible Assets (Details Textual) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'	'	'	'
Intangible amortization expense	$93	$78	$177	$147

Debt_Details

Debt (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Company's borrowings	'	'
Total notes payable	$245,637	$30,151
Bell, LLC promissory note—variable interest entity	'	'
Company's borrowings	'	'
Total notes payable	3,881	4,029
Convertible debt	'	'
Company's borrowings	'	'
Total notes payable	119,070	0
REG Geismar GOZone bonds	'	'
Company's borrowings	'	'
Total notes payable	100,000	0
REG Danville term loan	'	'
Company's borrowings	'	'
Total notes payable	3,525	5,626
REG Newton term loan	'	'
Company's borrowings	'	'
Total notes payable	16,880	18,143
REG Mason City term loan	'	'
Company's borrowings	'	'
Total notes payable	4,923	5,135
Other	'	'
Company's borrowings	'	'
Total notes payable	$1,239	$1,247

Debt_Details_Textual

Debt (Details Textual) (USD $)	Jun. 30, 2014	Oct. 31, 2008	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014	Jul. 08, 2014
In Thousands, except Per Share data, unless otherwise specified	GOZone Bonds	GOZone Bonds	Convertible debt	Convertible debt	Convertible debt	Convertible debt	Debt Instrument, Redemption, Period One	Debt Instrument, Redemption, Period Two	Subsequent Event
		Subsidiary		Long-term Debt	Stockholders' Equity	Deferred Financing and Equity Costs	Convertible debt	Convertible debt	GOZone Bonds
		Dynamic Fuels, LLC					D	D
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'	'
Value of notes issued	'	'	$143,750	'	'	'	'	'	$100,000
Interest rate	'	'	2.75%	'	'	'	'	'	'
Threshold Trading Days	'	'	'	'	'	'	20	5	'
Consecutive Trading Days	'	'	'	'	'	'	'30 days	'5 days	'
Principal conversion basis	'	'	'	'	'	'	'	1,000	'
Threshold Percentage of Stock Price Trigger	'	'	'	'	'	'	130.00%	98.00%	'
Trading Day Observation Period	'	'	'80 days	'	'	'	'	'	'
Conversion rate	'	'	75.3963	'	'	'	'	'	'
Initial conversion price	'	'	$13.26	'	'	'	'	'	'
Percentage of principal amount repurchased	'	'	100.00%	'	'	'	'	'	'
Net proceeds from convertible debt	'	'	143,750	118,719	25,031	4,563	'	'	'
Percentage of shares covered by capped call	'	'	92.50%	'	'	'	'	'	'
Cap price	'	'	16.02	'	'	'	'	'	'
Value of purchased capped calls	'	'	11,904	'	'	'	'	'	'
Proceeds from issuance	'	100,000	'	'	'	'	'	'	'
Effective interest rate	0.04%	'	3.80%	'	'	'	'	'	'
Letter of Credit	'	'	'	'	'	'	'	'	$101,315

Debt_Details_1

Debt (Details 1) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'
Amount borrowed under revolving line of credit	$19,825	$10,986
Maximum available to be borrowed under revolving line of credit	$20,175	$29,014

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Summary of Related Party Transactions	'	'	'	'
Cost of goods sold – Biodiesel	$14,283	$13,411	$21,429	$25,141
West Central	'	'	'	'
Summary of Related Party Transactions	'	'	'	'
Cost of goods sold – Biodiesel	14,283	13,411	21,429	25,141
Selling, general and administrative expenses	39	0	39	2
Interest expense	$1	$8	$1	$28

Related_Party_Transactions_Det1

Related Party Transactions (Details 1) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Summary of Related Party Balances	'	'
Accounts receivable	$247	$426
Other assets	0	35
Accounts payable	662	552
West Central	'	'
Summary of Related Party Balances	'	'
Accounts receivable	247	426
Other assets	0	35
Accounts payable	$662	$552

Related_Party_Transactions_Det2

Related Party Transactions (Details Textual) (West Central, USD $)	6 Months Ended
	Jun. 30, 2014
Related Party Transaction [Line Items]	'
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	5.00%
Annual land lease cost	$1
Lease Agreements	'
Related Party Transaction [Line Items]	'
Agreement initial term	'20 years
Additional Lease Period, Number of Extensions	6
Additional renewal period	'5 years
Raw material supply agreement	'
Related Party Transaction [Line Items]	'
Additional renewal period	'1 year
Delivery Requirement Period	'45 days
Accounts payable, amounts owed to related parties	$3,000,000

Derivative_Instruments_Details

Derivative Instruments (Details Textual)	Jun. 30, 2014
	Contract
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Open commodity contracts	1,501

Derivative_Instruments_Details1

Derivative Instruments (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets	'	'
Gross amounts of derivatives recognized at fair value	$1,161	$325
Cash collateral	13,087	13,896
Total gross amount recognized	14,248	14,221
Gross amounts offset	-2,093	-546
Net amount reported in the condensed consolidated balance sheet	12,155	13,675
Liabilities	'	'
Gross amounts of derivatives recognized at fair value	2,093	546
Cash collateral	0	0
Total gross amount recognized	2,093	546
Gross amounts offset	-2,093	-546
Net amount reported in the condensed consolidated balance sheet	$0	$0

Derivative_Instruments_Details2

Derivative Instruments (Details 1) (Cost of goods sold – Biodiesel, Commodity derivatives, USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Cost of goods sold – Biodiesel | Commodity derivatives	'	'	'	'
Derivative Instruments Gain Loss [Line Items]	'	'	'	'
Pre-tax gains (losses) included in the condensed consolidated statement of operations	($2,744)	$6,672	($3,438)	$8,039

Fair_Value_Measurement_Details

Fair Value Measurement (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Commodity contract derivatives	'	'
Assets (liabilities) measured at fair value	'	'
Liabilities, fair value	($932)	($221)
Commodity contract derivatives | Level 1	'	'
Assets (liabilities) measured at fair value	'	'
Liabilities, fair value	0	0
Commodity contract derivatives | Level 2	'	'
Assets (liabilities) measured at fair value	'	'
Liabilities, fair value	-932	-221
Commodity contract derivatives | Level 3	'	'
Assets (liabilities) measured at fair value	'	'
Liabilities, fair value	0	0
Contingent consideration for acquisition | LS9, Inc.	'	'
Assets (liabilities) measured at fair value	'	'
Liabilities, fair value	-16,666	'
Contingent consideration for acquisition | LS9, Inc. | Level 1	'	'
Assets (liabilities) measured at fair value	'	'
Liabilities, fair value	0	'
Contingent consideration for acquisition | LS9, Inc. | Level 2	'	'
Assets (liabilities) measured at fair value	'	'
Liabilities, fair value	0	'
Contingent consideration for acquisition | LS9, Inc. | Level 3	'	'
Assets (liabilities) measured at fair value	'	'
Liabilities, fair value	-16,666	'
Contingent consideration for acquisition | Dynamic Fuels, LLC	'	'
Assets (liabilities) measured at fair value	'	'
Liabilities, fair value	-28,900	'
Contingent consideration for acquisition | Dynamic Fuels, LLC | Level 1	'	'
Assets (liabilities) measured at fair value	'	'
Liabilities, fair value	0	'
Contingent consideration for acquisition | Dynamic Fuels, LLC | Level 2	'	'
Assets (liabilities) measured at fair value	'	'
Liabilities, fair value	0	'
Contingent consideration for acquisition | Dynamic Fuels, LLC | Level 3	'	'
Assets (liabilities) measured at fair value	'	'
Liabilities, fair value	-28,900	'
Money market funds	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	1,475	'
Money market funds | Level 1	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	1,475	'
Money market funds | Level 2	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	0	'
Money market funds | Level 3	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	0	'
Certificates of deposit	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	10,942	'
Certificates of deposit | Level 1	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	0	'
Certificates of deposit | Level 2	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	10,942	'
Certificates of deposit | Level 3	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	0	'
Commercial paper	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	32,963	'
Commercial paper | Level 1	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	0	'
Commercial paper | Level 2	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	32,963	'
Commercial paper | Level 3	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	0	'
Commercial notes/bonds	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	26,384	'
Commercial notes/bonds | Level 1	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	0	'
Commercial notes/bonds | Level 2	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	26,384	'
Commercial notes/bonds | Level 3	'	'
Assets (liabilities) measured at fair value	'	'
Assets, fair value	$0	'

Fair_Value_Measurement_Details1

Fair Value Measurement (Details 1) (Contingent Consideration for Acquisition, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014
LS9, Inc.	'	'
Liabilities measured at fair value on a recurring basis	'	'
Beginning balance	$17,050	$0
Fair value of contingent liability recorded at measurement date	0	17,050
Change in estimates included in earnings	-384	'
Settlements	0	'
Ending balance	16,666	17,050
Dynamic Fuels, LLC	'	'
Liabilities measured at fair value on a recurring basis	'	'
Beginning balance	0	0
Fair value of contingent liability recorded at measurement date	28,900	0
Change in estimates included in earnings	0	'
Settlements	0	'
Ending balance	$28,900	$0

Fair_Value_Measurement_Details2

Fair Value Measurement (Details 2) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Asset (Liability) Carrying Amount	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Debt and lines of credit	($269,343)	($45,166)
Fair Value	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Debt and lines of credit	($270,503)	($45,094)

Fair_Value_Measurement_Details3

Fair Value Measurement (Details Textual)	6 Months Ended
	Jun. 30, 2014
LS9, Inc.	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Fair Value Inputs, Discount Rate	8.00%
Dynamic Fuels, LLC	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Fair Value Inputs, Discount Rate	5.80%

Net_Income_Per_Share_Details

Net Income Per Share (Details)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total	6,653,069	1,836,971	6,913,240	1,769,415
Options to purchase common stock	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total	87,026	87,026	87,026	87,026
Warrants to purchase common stock	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total	17,916	0	17,916	17,916
Convertible notes	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total	5,419,109	0	5,419,109	0
Restricted stock units	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total	0	524,417	0	514,596
Stock appreciation rights	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total	1,129,018	1,225,528	1,389,189	1,149,877

Net_Income_Per_Share_Details_1

Net Income Per Share (Details 1) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
NET INCOME ATTRIBUTABLE TO THE COMPANY’S COMMON STOCKHOLDERS	$10,835	$19,573	$8,858	$58,007
Plus: change in undistributed dividends allocated to preferred stockholders	0	-839	0	0
Plus: distributed dividends to Preferred Stockholders	0	1,590	40	1,590
Plus (Less): effect of participating securities	0	2,480	-406	8,979
Net income available to common stockholders - Dilutive	$10,835	$22,804	$8,492	$68,576
Weighted-average shares used to compute basic net income per share	39,939,346	31,292,910	39,119,430	30,967,903
Adjustment to reflect conversion of preferred stock	0	5,390,042	0	5,688,055
Adjustment to reflect warrants to purchase common stock	0	812	0	0
Adjustment to reflect stock appreciation right conversions	15,241	0	9,706	0
Weighted-average shares used to compute diluted net income per share	39,954,587	36,683,764	39,129,136	36,655,958
Diluted	$0.27	$0.62	$0.22	$1.87

Reportable_Segments_Details

Reportable Segments (Details) (USD $)	3 Months Ended				6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Segment Reporting Information [Line Items]	'		'		'		'		'
Net revenues:	$332,918		$384,735		$551,958		$649,103		'
Income (loss) before income taxes:	-912		38,444		-3,378		115,036		'
Depreciation and amortization expense, net:	3,156		2,175		6,039		4,123		'
Cash paid for purchases of property, plant and equipment:	19,537		10,134		32,310		20,057		'
Assets:	1,069,096		'		1,069,096		'		740,855
Intersegment revenues	'		'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'		'
Net revenues:	-26,007		-28,866		-46,503		-15,011		'
Corporate and other	'		'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'		'
Income (loss) before income taxes:	-16,063	[1]	-11,737	[1]	-30,093	[1]	-21,840	[1]	'
Depreciation and amortization expense, net:	268	[1]	228	[1]	521	[1]	432	[1]	'
Cash paid for purchases of property, plant and equipment:	554	[1]	1,273	[1]	773	[1]	1,373	[1]	'
Assets:	232,761	[2]	'		232,761	[2]	'		275,368	[2]
Biodiesel | Segments	'		'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'		'
Net revenues:	332,859		384,688		551,871		649,014		'
Income (loss) before income taxes:	15,114		50,203		26,675		136,916		'
Depreciation and amortization expense, net:	2,836		1,915		5,425		3,640		'
Cash paid for purchases of property, plant and equipment:	18,352		8,486		30,906		18,210		'
Assets:	815,256		'		815,256		'		444,945
Services | Segments	'		'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'		'
Net revenues:	26,066		28,913		46,590		15,100		'
Income (loss) before income taxes:	37		-22		40		-40		'
Depreciation and amortization expense, net:	52		32		93		51		'
Cash paid for purchases of property, plant and equipment:	631		375		631		474		'
Assets:	$21,079		'		$21,079		'		$20,542
[1]	Corporate and other includes income/(expense) not associated with the reportable segments, such as corporate general and administrative expenses, shared service expenses, interest expense and interest income.
[2]	Corporate and other includes cash and other assets not associated with the reportable segments, including investments.

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'
July 1, 2014 through December 31, 2014	$1,874
2015	3,748
2016	3,748
2017	3,748
2018	3,748
2019 and thereafter	19,590
Total	$36,456

Subsequent_Events_Details

Subsequent Events (Details) (GOZone Bonds, Subsequent Event, USD $)	0 Months Ended
In Thousands, unless otherwise specified	Jul. 08, 2014	Jul. 08, 2014
GOZone Bonds | Subsequent Event	'	'
Subsequent Event [Line Items]	'	'
Letter of Credit	'	$101,315
Proceeds from issuance	'	100,000
Interest	$1,315	'