Renewable Energy (REGI) 10-Q 7 Aug 15 2015 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 31, 2015
Document Document And Entity Information [Abstract]
Entity Registrant Name	Renewable Energy Group, Inc.
Entity Central Index Key	1,463,258
Document Type	10-Q
Document Period End Date	Jun. 30, 2015
Amendment Flag	false
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		43,441,688

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 70,978	$ 63,516
Marketable securities	30,225	16,770
Accounts receivable, net (includes amounts owed by related parties of $0 and $36, respectively)	59,888	294,669
Inventories	95,166	97,508
Deferred income taxes	12	0
Prepaid expenses and other assets	41,943	43,135
Restricted cash	0	12,845
Total current assets	298,212	528,443
Property, plant and equipment, net	500,516	493,196
Goodwill	191,444	188,275
Intangible assets, net	28,508	28,837
Investments	10,331	9,736
Other assets	17,578	19,586
Restricted cash	106,815	104,815
TOTAL ASSETS	1,153,404	1,372,888
CURRENT LIABILITIES:
Revolving lines of credit	26,340	16,679
Current maturities of long-term debt	5,940	5,746
Accounts payable (includes amounts owed to related parties of $0 and $1,101, respectively)	62,175	202,821
Accrued expenses and other liabilities	16,002	28,486
Deferred income taxes	11,150	14,899
Deferred revenue	0	16,680
Total current liabilities	121,607	285,311
Unfavorable lease obligation	18,257	19,170
Deferred income taxes	12,119	6,905
Contingent consideration for acquisitions	29,681	30,091
Long-term debt	247,001	247,183
Other liabilities	4,076	5,566
Total liabilities	$ 432,741	$ 594,226
COMMITMENTS AND CONTINGENCIES
EQUITY:
Common stock ($.0001 par value; 300,000,000 shares authorized; 43,441,688 and 44,422,881 shares outstanding, respectively)	$ 4	$ 4
Common stock—additional paid-in-capital	455,757	453,109
Retained earnings	280,975	321,083
Accumulated other comprehensive loss	(3,332)	(11)
Treasury stock (1,843,785 and 585,150 shares outstanding, respectively)	(16,530)	(4,412)
Total equity attributable to the Company's shareholders	716,874	769,773
Non-controlling interest	3,789	8,889
Total equity	720,663	778,662
TOTAL LIABILITIES AND EQUITY	$ 1,153,404	$ 1,372,888

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Accounts receivable, amounts owed by related parties	$ 0	$ 36
Accounts payable, amounts owed to related parties	$ 0	$ 1,101
Common stock, par or stated value per share	$ 0.0001	$ 0.0001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares, outstanding	43,441,688	44,422,881
Treasury stock, shares outstanding	1,843,785	585,150

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
REVENUES:
Biomass-based diesel sales	$ 366,455	$ 327,837	$ 587,481	$ 536,959
Biomass-based diesel government incentives	7,278	5,022	17,066	14,912
Total biodiesel sales	373,733	332,859	604,547	551,871
Services	29	59	133	87
Total revenues	373,762	332,918	604,680	551,958
COSTS OF GOODS SOLD:
Biomass-based diesel	357,832	303,462	600,342	503,767
Biomass-based diesel—related parties	0	14,283	4,542	21,429
Services	23	22	84	47
Total cost of goods sold	357,855	317,767	604,968	525,243
GROSS PROFIT (LOSS)	15,907	15,151	(288)	26,715
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	15,359	12,410	32,034	24,064
RESEARCH AND DEVELOPMENT EXPENSE	4,390	3,217	8,250	5,090
LOSS FROM OPERATIONS	(3,842)	(476)	(40,572)	(2,439)
OTHER INCOME (EXPENSE), NET:
Change in fair value of contingent consideration	2,121	384	1,828	384
Other income, net	1,779	384	2,344	432
Interest expense	(2,928)	(1,204)	(5,671)	(1,755)
Total other income (expenses)	972	(436)	(1,499)	(939)
LOSS BEFORE INCOME TAXES	(2,870)	(912)	(42,071)	(3,378)
INCOME TAX BENEFIT	707	11,919	1,604	12,026
NET INCOME (LOSS)	(2,163)	11,007	(40,467)	8,648
LESS—NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST	(162)	0	(359)	0
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY	(2,001)	11,007	(40,108)	8,648
PLUS—GAIN ON REDEMPTION OF PREFERRED STOCK	0	0	0	378
LESS—EFFECT OF CHANGES TO PREFERRED STOCK	0	0	0	(40)
LESS—EFFECT OF PARTICIPATING SHARE-BASED AWARDS	0	(172)	0	(128)
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY’S COMMON STOCKHOLDERS	$ (2,001)	$ 10,835	$ (40,108)	$ 8,858
NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS:
BASIC (in dollars per share)	$ (0.05)	$ 0.27	$ (0.91)	$ 0.23
DILUTED (in dollars per share)	$ (0.05)	$ 0.27	$ (0.91)	$ 0.22
WEIGHTED AVERAGE SHARES USED TO COMPUTE NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS:
BASIC (in shares)	43,736,366	39,939,346	44,048,017	39,119,430
DILUTED (in shares)	43,736,366	39,954,587	44,048,017	39,129,136

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (2,163)	$ 11,007	$ (40,467)	$ 8,648
Unrealized gains (losses) on marketable securities, net of taxes of $0 and $0, respectively	(24)	30	(15)	(22)
Foreign currency translation adjustments	765	0	(3,876)	0
Other comprehensive income (loss)	741	30	(3,891)	(22)
Comprehensive income (loss)	(1,422)	11,037	(44,358)	8,626
Less—Comprehensive income (loss) attributable to noncontrolling interest	(570)	0	(570)	0
Comprehensive income (loss) attributable to the Company	$ (852)	$ 11,037	$ (43,788)	$ 8,626

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Taxes on unrealized losses on marketable securities	$ 0	$ 0	$ 0	$ 0

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Redeemable Preferred Stock and Equity (Unaudited) - USD ($) $ in Thousands	Total	Redeemable Preferred Stock	Common Stock	Common Stock - Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interest
Beginning Balance at Dec. 31, 2013	$ 594,070	$ 3,963	$ 4	$ 359,818	$ 238,134	$ 0	$ (3,886)	$ 0
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 and restricted stock units to common stock	23	$ (23)		23
Conversion of Series B Preferred Stock and restricted stock units 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
Conversion of restricted stock units to common stock	0
Conversion of restricted stock units to common stock, 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)
Issuance of common stock in acquisition, shares			5,724,172
Stock compensation expense	2,649			2,649
Series B Preferred Stock dividends paid	(40)				(40)
Net change in unrealized losses on marketable securities	(22)					(22)
Foreign currency translation adjustment	0
Net income (loss)	8,648				8,648
Ending Balance at Jun. 30, 2014	673,653	$ 0	$ 4	430,437	247,120	(22)	(3,886)	0
Ending Balance, Shares at Jun. 30, 2014		0	42,306,595
Beginning Balance at Dec. 31, 2014	778,662	$ 0	$ 4	453,109	321,083	(11)	(4,412)	8,889
Beginning Balance, shares at Dec. 31, 2014		0	44,422,881
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	412			412
Issuance of common stock, shares			37,966
Conversion of restricted stock units to common stock	(599)						(599)
Conversion of restricted stock units to common stock, shares		0	174,498
Treasury stock purchases	$ (11,519)						(11,519)
Treasury stock purchases, shares	(64,978)		(1,193,657)
Acquisitions of noncontrolling interests	$ (4,171)							(4,171)
Stock compensation expense	2,236			2,236
Net change in unrealized losses on marketable securities	(15)					(15)
Foreign currency translation adjustment	(3,876)					(3,306)		(570)
Net income (loss)	(40,467)				(40,108)			(359)
Ending Balance at Jun. 30, 2015	$ 720,663	$ 0	$ 4	$ 455,757	$ 280,975	$ (3,332)	$ (16,530)	$ 3,789
Ending Balance, Shares at Jun. 30, 2015		0	43,441,688

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Redeemable Preferred Stock and Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2014
Statement of Stockholders' Equity [Abstract]
Issuance cost of common stock issued in acquisition	$ 884
Taxes on convertible notes conversion feature	5,082
Issuance costs on convertible notes conversion feature	$ 881

Condensed Consolidated Stateme9

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (40,467)	$ 8,648
Adjustments to reconcile net loss to net cash flows from operating activities:
Depreciation expense	11,747	6,194
Amortization expense of assets and liabilities, net	213	(155)
Accretion of convertible note discount	2,327	351
Amortization of marketable securities	103	0
Change in fair value of contingent consideration	(1,828)	(384)
Provision for doubtful accounts	(986)	(33)
Stock compensation expense	2,236	2,649
Deferred tax benefit	(1,749)	(12,810)
Other operating activities	(11)	257
Changes in asset and liabilities, net of effects from acquisitions:
Accounts receivable, net	246,260	35,070
Inventories	1,473	17,610
Prepaid expenses and other assets	(987)	(12,637)
Accounts payable	(141,340)	(2,769)
Accrued expenses and other liabilities	(10,028)	(5,319)
Deferred revenue	(16,680)	(12,499)
Net cash flows provided by operating activities	50,283	24,173
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash paid for marketable securities	(52,153)	(70,553)
Cash received from maturities of marketable securities	38,597	0
Change in restricted cash	10,845	(101,315)
Cash paid for purchase of property, plant and equipment	(27,707)	(32,310)
Cash paid for acquisitions and additional interests, net of cash acquired	(4,171)	(31,469)
Other investing activities	0	27
Net cash flows used in investing activities	(34,589)	(235,620)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net borrowings on lines of credit	9,661	8,839
Cash received from issuance of debt	411	143,750
Cash paid for capped call transactions	0	(11,904)
Cash paid on debt	(2,673)	(17,285)
Cash paid for debt issuance costs	(365)	(3,904)
Cash paid for equity issuance costs	0	(1,522)
Cash paid for treasury stock	(12,118)	(529)
Cash paid for preferred stock dividends	0	(40)
Cash paid for redemption of preferred stock	0	(3,562)
Cash paid for contingent consideration settlement	(1,995)	0
Net cash flows provided by (used in) financing activities	(7,079)	113,843
NET CHANGE IN CASH AND CASH EQUIVALENTS	8,615	(97,604)
CASH AND CASH EQUIVALENTS, Beginning of period	63,516	153,227
Effect of exchange rate changes on cash	(1,153)	0
CASH AND CASH EQUIVALENTS, End of period	70,978	55,623
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION:
Cash paid/(received) for income taxes	(44)	84
Cash paid for interest	3,372	1,059
Amounts included in period-end accounts payable for:
Purchases of property, plant and equipment	8,812	4,700
Debt issuance cost	14	469
Incentive stock liability for raw material supply agreement	$ 159	206
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
Impairment of property, plant and equipment	$ 11,027

Basis of Presentation and Natur

Basis of Presentation and Nature of the Business	6 Months Ended
	Jun. 30, 2015
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 filed on March 6, 2015. 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. As of June 30, 2015 , the Company operates a network of nine operating biomass-based diesel production facilities with aggregate nameplate production capacity of 332 million gallons per year, or mmgy. A number of these plants are “multi-feedstock capable” which allows them to use a broad range of lower cost feedstocks, such as inedible corn oil, used cooking oil and inedible animal fats in addition to vegetable oils, such as soybean oil and canola oil. The Company expanded its business to Europe by acquiring a majority interest in Petrotec AG (Petrotec) in December 2014. Petrotec is a fully-integrated company that produces biodiesel at its two biorefineries in Emden and Oeding, Germany to sell to the European market. The biomass-based diesel industry and the Company’s business have benefited from the continuation of certain federal and state incentives. The federal biodiesel tax credit expired on December 31, 2014 and it is uncertain whether it will be reinstated. This revocation along with other amendments of any one or more of those laws, could adversely affect the financial results of the Company.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES The Company has disclosed a summary of the Company's significant accounting policies in its Annual Report on Form 10-K for the year ended December 31, 2014 . There have been no material changes from the policies previously disclosed other than those noted below. Restricted Cash At June 30, 2015 , current restricted cash was $0 . At December 31, 2014 , current restricted cash was $12,845 , which was held in certificates of deposit as pledges for a letter of credit to support a subsidiary's trade activities and the Company's tender offer to acquire the remaining interest at Petrotec. Non-current restricted cash consists of $101,315 as of June 30, 2015 and December 31, 2014 , respectively, which is held in a certificate of deposit and pledged to Bank of America, who issued a letter of credit on the Company's behalf to support the payments on the Company's GOZone Bonds. In addition, at June 30, 2015 and December 31, 2014 , non-current restricted cash included amounts of $5,500 and $3,500 , respectively, which is held in a certificate of deposit and pledged to Bank of America, who issued a letter of credit to support a subsidiary's trade activities. The Company classifies restricted cash between current and non-current assets based on the length of time of the restricted use. Accounts Receivable Accounts receivable are carried at invoiced amount less allowance for doubtful accounts. Management estimates the allowance for doubtful accounts based on existing economic conditions, the financial conditions of customers, and the amount and age of past due accounts. Receivables are considered past due if full payment is not received by the contractual due date. Past due accounts are generally written off against the allowance for doubtful accounts only after reasonable collection attempts have been exhausted. At June 30, 2015 , most outstanding receivable amounts related to the 2014 biodiesel mixture excise tax credit reinstatement were received. Property, Plant and Equipment Property, plant and equipment is recorded at cost less accumulated depreciation. Maintenance and repairs are expensed as incurred. Depreciation expense is computed on a straight-line method based upon estimated useful lives of the assets. In April 2015, the Company experienced a fire at its Geismar facility, resulting in the shutdown of the facility. The Company estimated fixed assets of approximately $11,027 were impaired as a result of the fire. As of the date of this report, the Company has recovered an interim receivable amount of $5,000 from insurance for the property damage and believes it is probable that it will recover the remaining costs under its insurance policies. As such, an amount equal to the estimated impairment loss was recorded as part of accounts receivable on the Condensed Consolidated Balance Sheets at June 30, 2015 and no impact on earnings was recognized. The Company intends to file insurance claims under its business interruption policies as a result of the business interruption it experienced in connection with the fire at the Geismar facility. As a result, the full amount of proceeds to be received has not been determined and no amounts related to business interruption insurance have been recognized in earnings at June 30, 2015 . Goodwill Goodwill is tested for impairment annually on July 31 or when impairment indicators exist. Goodwill is allocated and tested for impairment by reporting units. The analysis is based on a comparison of the carrying value of the reporting unit to its fair value, determined utilizing both a discounted cash flow methodology and a market comparable methodology. The determination of whether or not the asset has become impaired involves a significant level of judgment in the assumptions underlying the approach used to determine the value of the Company’s reporting units. Changes in estimates of future cash flows caused by items such as unforeseen events or sustained unfavorable changes in market conditions could negatively affect the fair value of the reporting unit’s goodwill asset and result in an impairment charge. The 2014 annual impairment test determined that the fair value of the biomass-based diesel reporting unit exceeded its carrying value by approximately 7% and the services reporting unit exceeded its carrying value by approximately 66% . The Company also reviewed goodwill recorded from the acquisitions of LS9, Inc., Syntroleum Corporation and Dynamic Fuels, LLC during the annual impairment testing. There have been no impairment indicators in the first six months of 2015 that indicate an additional assessment needs to be performed. Share Repurchase Programs In February 2015, the Company's board of directors approved a share repurchase program of up to $30,000 of the Company's shares of Common Stock. Shares may be repurchased from time to time in open market transactions, privately negotiated transactions or by other means. The Company accounts for share repurchases using the cost method. Under this method, the cost of the share repurchase is recorded entirely in treasury stock, a contra equity account. During the six months ended June 30, 2015 , the Company repurchased shares of Common Stock in the amount of $11,519 under this share repurchase program. Foreign Currency Transactions and Translation The Company’s reporting and functional currency is U.S. dollars. Monetary assets and liabilities denominated in currencies other than U.S. dollars are remeasured into their respective functional currencies at exchange rates in effect at the balance sheet date. The resulting exchange gain or loss is included in the Company’s Condensed Consolidated Statements of Operations as foreign exchange gain (loss) unless the remeasurement gain or loss relates to an intercompany transaction that is of a long-term investment nature and for which settlement is not planned or anticipated in the foreseeable future. Gains or losses arising from translation of such transactions are reported as a component of accumulated other comprehensive income (loss) in the Company’s Condensed Consolidated Balance Sheets. The Company translates the assets and liabilities of its foreign subsidiaries from their respective functional currencies to U.S. dollars at the appropriate spot rates as of the balance sheet date. Generally, our foreign subsidiaries use the local currency as their functional currency. Changes in the carrying value of these assets and liabilities attributable to fluctuations in spot rates are recognized in foreign currency translation adjustment, a component of accumulated other comprehensive income (loss) in the Company’s Condensed Consolidated Balance Sheets. Income Taxes The Company uses the asset and liability method to account for income taxes. Accordingly, deferred income taxes are recognized for differences between the financial statement and tax bases of assets and liabilities at enacted statutory tax rates in effect for the years in which differences are expected to reverse. Changes in tax rates are recognized directly to the income statement as they arise. Consideration is given to positive and negative evidence related to the realization of the deferred tax assets and valuation allowances are established to reduce deferred tax assets to the amounts expected to be realized. Significant judgment is required in making this assessment. For uncertain tax positions, the Company recognizes tax benefits that are more likely than not to be sustained upon examination by tax authorities. The amount recognized is measured as the largest amount of benefit that is greater than 50 percent likely to be realized. With regard to non-US subsidiaries, the Company will indefinitely reinvest any future earnings outside of the U.S. and currently does not have any undistributed earnings. New Accounting Standards In April 2015, the FASB issued ASU 2015-03 simplifying the presentation of debt issuance costs. The amendments in this update require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The guidance in the ASU is effective for financial statements issued for fiscal years beginning after December 15, 2015 and interim periods within fiscal years beginning after December 15, 2016. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements. In July 2015, the FASB decided to defer by one year the effective dates of the new revenue recognition standard as provided by the 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 . Early adoption is permitted for all entities, but not before the original public entity effective date. For public companies, the update will now be effective for interim and annual periods beginning after December 15, 2017. The Company is currently continuing to assess the impact that this guidance will have on its consolidated financial statements.

Acquisitions and Equity Transac

Acquisitions and Equity Transactions	6 Months Ended
	Jun. 30, 2015
Business Combinations [Abstract]
Acquisitions and Equity Transactions	ACQUISITIONS AND EQUITY TRANSACTIONS Petrotec AG On December 24, 2014 , the Company acquired 69.08% of the outstanding common shares and voting interest of Petrotec. The results of Petrotec’s operations have been included in the consolidated financial statements since that date. The Company has not completed its initial accounting for this business combination as the valuation of the real and personal property and goodwill has not been finalized. The following table summarizes the consideration paid for Petrotec: December 24, 2014 Consideration at fair value for Petrotec: Common stock $ 20,022 The fair value of the 2,070,538 shares of the Company's Common Stock issued for the acquisition was determined on the basis of the closing market price of the Company's Common Stock at the date of acquisition. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date. December 24, 2014 Assets (liabilities) acquired of Petrotec: Cash $ 13,523 Accounts receivable 4,989 Inventory 9,470 Other current assets 3,583 Property, plant and equipment 25,026 Total identifiable assets acquired 56,591 Accounts payable (8,171 ) Accrued expenses and other liabilities (2,151 ) Debt (16,192 ) Non-current liabilities (1,462 ) Total liabilities assumed (27,976 ) Net identifiable assets acquired 28,615 Goodwill 369 Non-controlling interest (8,962 ) Net assets acquired $ 20,022 The $369 of goodwill was assigned to the Biomass-based diesel segment, all of which is expected to be deductible for income tax purposes. At December 31, 2014 , the fair value of the 30.92% noncontrolling interest in Petrotec was estimated to be $8,962 . The fair value of the noncontrolling interest was estimated using a combination of the income approach and a market approach. The Company recognized $1,289 of acquisition related costs that were expensed in the last quarter of 2014. In addition, during the six months ended June 30, 2015 , the Company acquired additional common shares of Petrotec as part of the cash tender offer and open market purchases for $4,171 . At June 30, 2015 , the Company owned 84.91% of the outstanding common shares and voting interest of Petrotec. In April 2015, Petrotec's application to de-list its shares of common stock from the Frankfurt Stock Exchange was approved. As a result, Petrotec's shares of common stock will no longer be traded on any regulated market of any stock exchange at the end of the October 8, 2015 trading day.

Marketable Securities

Marketable Securities	6 Months Ended
	Jun. 30, 2015
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, 2015 Maturity Gross Amortized Cost Total Unrealized Gains Total Unrealized Losses Fair Value Commercial paper Within one year $ 6,979 $ 1 $ — $ 6,980 Corporate bonds Within one year 23,032 — (27 ) 23,005 Certificates of deposit Within one year 240 — — 240 Total $ 30,251 $ 1 $ (27 ) $ 30,225 As of December 31, 2014 Maturity Gross Amortized Cost Total Unrealized Gains Total Unrealized Losses Fair Value Corporate bonds Within one year $ 6,781 $ — $ (6 ) $ 6,775 Certificates of deposit Within one year 10,000 — (5 ) 9,995 Total $ 16,781 $ — $ (11 ) $ 16,770

Inventories

Inventories	6 Months Ended
	Jun. 30, 2015
Inventory Disclosure [Abstract]
Inventories	INVENTORIES Inventories consist of the following: June 30, 2015 December 31, 2014 Raw materials $ 37,263 $ 23,117 Work in process 3,132 2,879 Finished goods 54,771 71,512 Total $ 95,166 $ 97,508

Prepaid Expenses and Other Asse

Prepaid Expenses and Other Assets	6 Months Ended
	Jun. 30, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid Expenses and Other Assets	PREPAID EXPENSES AND OTHER ASSETS Prepaid expense and other assets consist of the following: June 30, 2015 December 31, 2014 Commodity derivatives and related collateral, net $ 8,093 $ 12,938 Prepaid expenses 6,650 7,901 Deposits 3,948 4,481 RIN inventory 17,459 10,795 Taxes receivable 2,062 2,843 Other 3,731 4,177 Total $ 41,943 $ 43,135 RIN inventory values were adjusted in the amounts of $695 and $1,042 at June 30, 2015 and December 31, 2014 , respectively, to reflect the lower of cost or market. Other noncurrent assets consist of the following: June 30, 2015 December 31, 2014 Debt issuance costs (net of accumulated amortization of $1,653 and $1,474, respectively) $ 4,556 $ 5,152 Spare parts inventory 3,410 3,440 Deposits 3,370 4,370 Other 6,242 6,624 Total $ 17,578 $ 19,586

Goodwill

Goodwill	6 Months Ended
	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	GOODWILL The following table shows the carrying amount of goodwill by reportable segment as of December 31, 2014 and the changes in goodwill for the six months ended June 30, 2015 : Biomass-based diesel Services Total Balance, December 31, 2014 $ 172,195 $ 16,080 $ 188,275 Finalization of purchase accounting 3,202 — 3,202 Effect of exchange rate changes on goodwill (33 ) — (33 ) Balance, June 30, 2015 $ 175,364 $ 16,080 $ 191,444

Intangible Assets

Intangible Assets	6 Months Ended
	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	INTANGIBLE ASSETS Intangible assets consist of the following: June 30, 2015 Cost Accumulated Amortization Net Weighted Average Remaining Life Raw material supply agreement $ 6,073 $ (1,318 ) $ 4,755 10.5 years Renewable hydrocarbon diesel technology 8,300 (599 ) 7,701 14.0 years Ground lease 200 (104 ) 96 6.4 years Total amortizing intangibles 14,573 (2,021 ) 12,552 In-process research and development, indefinite lives 15,956 — 15,956 Total intangible assets $ 30,529 $ (2,021 ) $ 28,508 December 31, 2014 Cost Accumulated Amortization Net Weighted Average Remaining Life Raw material supply agreement $ 5,914 $ (1,113 ) $ 4,801 11.0 years Renewable hydrocarbon diesel technology 8,300 (323 ) 7,977 14.5 years Ground lease 200 (97 ) 103 6.9 years Total amortizing intangibles 14,414 (1,533 ) 12,881 In-process research and development, indefinite lives 15,956 — 15,956 Total intangible assets $ 30,370 $ (1,533 ) $ 28,837 The Company recorded intangible amortization expense of $252 and $489 for the three and six months ended June 30, 2015 , respectively and $93 and $177 for the three and six months ended June 30, 2014 , respectively. The estimated intangible asset amortization expense for fiscal year 2015 through fiscal year 2021 and thereafter is as follows: July 1, 2015 through December 31, 2015 $ 515 2016 1,044 2017 1,058 2018 1,073 2019 1,088 2020 1,104 2021 and thereafter 6,670 Total $ 12,552

Debt

Debt	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Debt	DEBT The Company’s debt is as follows: June 30, 2015 December 31, 2014 2.75% Convertible Senior Notes, $143,750 face amount, due in June 2019 $ 123,681 $ 121,354 REG Geismar GOZone bonds, secured, variable interest rate of daily LIBOR, due in October 2033 100,000 100,000 REG Danville term loan, secured, variable interest rate of LIBOR plus 5%, due in December 2017 763 1,513 REG Newton term loan, secured, variable interest rate of LIBOR plus 4%, due in December 2018 18,548 19,868 REG Mason City term loan, fixed interest rate of 5%, due in July 2019 4,126 4,566 REG Ames term loans, secured, fixed interest rates of 3.5% and 4.25%, due in January 2018 and December 2019, respectively 4,065 4,226 Other 1,758 1,402 Total debt $ 252,941 $ 252,929 Revolving Lines of Credit June 30, 2015 December 31, 2014 Amount borrowed under revolving lines of credit $ 26,340 $ 16,679 Maximum available to be borrowed under revolving line of credit $ 7,984 $ 20,719

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2015
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS The Company reassesses its related parties at reporting dates and has determined that West Central Cooperative (West Central) is no longer a related party as West Central no longer holds ten percent or more of the Company’s outstanding Common Stock nor a board seat on the Company board. Summary of Related Party Balances - Condensed Consolidated Statements of Operations Three Months Three Months Six Months Six Months Cost of goods sold – Biomass-based diesel $ — $ 14,283 $ 4,542 $ 21,429 Selling, general and administrative expenses $ — $ 39 $ — $ 39 Summary of Related Party Balances - Condensed Consolidated Balance Sheets As of As of Accounts receivable $ — $ 36 Accounts payable $ — $ 1,101

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2015
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 reduce the risk of price volatility related to anticipated purchases of feedstock raw materials and to protect gross profit margins from potentially adverse effects of price volatility on biomass-based diesel 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 biomass-based diesel costs of goods sold reflected in current results of operations. As of June 30, 2015 , the Company had 3,655 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: June 30, 2015 December 31, 2014 Assets Liabilities Assets Liabilities Gross amounts of derivatives recognized at fair value $ 4,058 $ 594 $ 14,901 $ 205 Cash collateral 4,629 — 2,870 4,628 Total gross amount recognized 8,687 594 17,771 4,833 Gross amounts offset (594 ) (594 ) (4,833 ) (4,833 ) Net amount reported in the condensed consolidated balance sheet $ 8,093 $ — $ 12,938 $ — The following table sets forth the commodity contract derivatives gains (losses) included in the Condensed Consolidated Statements of Operations: Location of Gain (Loss) Three Months Three Months Six Months Six Months Commodity derivatives Cost of goods sold – Biomass-based diesel $ (3,570 ) $ (2,744 ) $ (3,990 ) $ (3,438 )

Fair Value Measurement

Fair Value Measurement	6 Months Ended
	Jun. 30, 2015
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, 2015 Total Level 1 Level 2 Level 3 Money market funds $ 1,690 $ 1,690 $ — $ — Certificates of deposit 240 — 240 — Commercial paper 6,980 — 6,980 — Commercial notes/bonds 23,005 — 23,005 — Commodity contract derivatives 3,464 847 2,617 — Contingent consideration for LS9 acquisition (6,159 ) — — (6,159 ) Contingent consideration for Dynamic Fuels acquisition (29,337 ) — — (29,337 ) $ (117 ) $ 2,537 $ 32,842 $ (35,496 ) As of December 31, 2014 Total Level 1 Level 2 Level 3 Money market funds $ 302 $ 302 $ — $ — Certificates of deposit 9,995 — 9,995 — Commercial notes/bond 6,775 — 6,775 — Commodity contract derivatives 14,696 6,885 7,811 — Contingent consideration for LS9 acquisition (8,624 ) — — (8,624 ) Contingent consideration of Dynamic Fuels acquisition (30,695 ) — — (30,695 ) $ (7,551 ) $ 7,187 $ 24,581 $ (39,319 ) 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 Balance at beginning of period, January 1, 2015 $ 8,624 $ 30,695 Change in estimates included in earnings (31 ) 324 Settlements — (1,052 ) Balance at end of period, March 31, 2015 8,593 29,967 Change in estimates included in earnings (2,434 ) 313 Settlements — (943 ) Balance at end of period, June 30, 2015 $ 6,159 $ 29,337 Contingent Consideration for LS9 Acquisition Contingent Consideration for Dynamic Fuels Acquisition Balance at beginning of period, January 1, 2014 $ — $ — Fair value of contingent consideration at measurement date 17,050 — Balance at end of period, March 31, 2014 17,050 — Fair value of contingent consideration at measurement date — 28,900 Change in estimates included in earnings (384 ) — Settlements — — Balance at end of period, 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, 2015 As of December 31, 2014 Asset (Liability) Fair Value Asset (Liability) Fair Value Financial liabilities: Debt and lines of credit $ (279,281 ) $ (276,788 ) $ (269,608 ) $ (270,331 ) 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, which include certificates of deposit, commercial papers and commercial notes/bonds 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 of contracts based on quoted prices of identical assets in an active exchange-traded market is reflected in Level 1. Contract fair value that is determined based on quoted prices of similar contracts in over-the-counter markets is 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 hydrocarbon 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 (Loss) Per Share

Net Income (Loss) Per Share	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	NET INCOME (LOSS) PER SHARE Basic net income (loss) per 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 units (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 (loss) per share attributable to common stockholders during the periods presented as the effect was anti-dilutive: Three Months Three Months Six Months Six Months Options to purchase common stock 87,026 87,026 87,026 87,026 Stock appreciation rights 2,433,636 1,129,018 2,119,168 1,389,189 Warrants to purchase common stock — 17,916 — 17,916 Convertible notes 10,838,218 5,419,109 10,838,218 5,419,109 Total 13,358,880 6,653,069 13,044,412 6,913,240 The following table presents the calculation of diluted net loss per share: Three Months Three Months Six Months Six Months Net income (loss) attributable to the Company’s common stockholders - Basic $ (2,001 ) $ 10,835 $ (40,108 ) $ 8,858 Plus: distributed dividends to Preferred Stockholders — — — 40 Less: effect of participating securities — — — (406 ) Net income (loss) attributable to common stockholders - Dilutive $ (2,001 ) $ 10,835 $ (40,108 ) $ 8,492 Shares: Weighted-average shares used to compute basic net income (loss) per share 43,736,366 39,939,346 44,048,017 39,119,430 Adjustment to reflect stock appreciation right conversions — 15,241 — 9,706 Weighted-average shares used to compute diluted net income (loss) per share 43,736,366 39,954,587 44,048,017 39,129,136 Net income (loss) per share attributable to common stockholders: Diluted $ (0.05 ) $ 0.27 $ (0.91 ) $ 0.22

Reportable Segments

Reportable Segments	6 Months Ended
	Jun. 30, 2015
Segment Reporting [Abstract]
Reportable Segments	REPORTABLE SEGMENTS The Company reports its reportable segments based on products and services provided to customers, which include Biomass-based diesel, 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 Biomass-based diesel segment processes waste vegetable oils, animal fats, virgin vegetable oils and other feedstocks and methanol into biomass-based diesel. The Biomass-based diesel segment also includes the Company’s purchases and resale of biomass-based diesel produced by third parties. Revenues are 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 Biomass-based diesel 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 Net revenues: Biomass-based diesel $ 373,733 $ 332,859 $ 604,547 $ 551,871 Services 31,489 26,066 50,300 46,590 Intersegment revenues (31,460 ) (26,007 ) (50,167 ) (46,503 ) $ 373,762 $ 332,918 $ 604,680 $ 551,958 Income (loss) before income taxes: Biomass-based diesel $ 11,511 $ 15,114 $ (8,588 ) $ 26,675 Services 6 37 49 40 Corporate and other (a) (14,387 ) (16,063 ) (33,532 ) (30,093 ) $ (2,870 ) $ (912 ) $ (42,071 ) $ (3,378 ) Depreciation and amortization expense, net: Biomass-based diesel $ 5,450 $ 2,836 $ 10,658 $ 5,425 Services 76 52 138 93 Corporate and other (a) 708 268 1,164 521 $ 6,234 $ 3,156 $ 11,960 $ 6,039 Cash paid for purchases of property, plant and equipment: Biomass-based diesel $ 15,055 $ 18,352 $ 25,545 $ 30,906 Services 403 631 1,125 631 Corporate and other (a) 72 554 1,037 773 $ 15,530 $ 19,537 $ 27,707 $ 32,310 As of As of Assets: Biomass-based diesel $ 912,649 $ 899,211 Services 21,476 20,750 Corporate and other (b) 219,279 452,927 $ 1,153,404 $ 1,372,888 (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. Geographic Information: The following geographic data include net sales attributed to the countries based on the location of the subsidiary making the sale and long-lived assets based on physical location. Long-lived assets represent the net book value of property, plant and equipment. Three Months Three Months Six Months Six Months Net revenues: United States $ 335,681 $ 332,918 $ 536,606 $ 551,958 Foreign 38,081 — 68,074 — $ 373,762 $ 332,918 $ 604,680 $ 551,958 As of June 30, 2015 As of December 31, 2014 Long-lived assets: United States $ 478,320 $ 468,170 Foreign 22,196 25,026 $ 500,516 $ 493,196

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2015
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.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS On July 16, 2015, the Company and its wholly-owned subsidiaries, REG Services Group, LLC and REG Marketing & Logistics Group, LLC entered into Amendment No. 9 (the “Amendment”) to that certain Credit Agreement, dated as of December 23, 2011 (as further amended, restated, supplemented or otherwise modified from time to time, the “Credit Agreement”) with Wells Fargo Capital Finance, LLC, which increased the total maximum revolving loan commitments thereunder from $40,000 to $60,000 . In addition, among other more minor changes, the Amendment adjusted the interest rate margins, reduced the unused line fee from 0.50% to 0.375% , and increased the letter of credit sub-facility as of any date of determination from $10,000 to $25,000 . On July 31, 2015, the Company entered into an asset purchase agreement with Imperium Renewables, Inc. (“Imperium”) pursuant to which it has agreed to acquire substantially all the assets of Imperium, including a 100 -million gallon nameplate capacity biomass-based diesel refinery and deepwater port terminal at the Port of Grays Harbor, Washington. Under the terms of the agreement, the Company will pay Imperium $15,000 in cash and issue 1,500,000 shares of its Common Stock in exchange for substantially all of Imperium’s assets. In addition to these payments, the Company will pay either $1,750 in cash or 175,000 shares of its Common Stock at closing as elected by the Company. For two years post-closing, Imperium may receive up to a $0.05 /gallon payment for biomass-based diesel produced and sold. In addition at closing, Imperium will retain its net working capital value of approximately $25,000 . The Company will also assume $5,200 of Imperium’s debt from Umpqua Bank, which has agreed to provide REG Grays Harbor, LLC, a wholly-owned subsidiary of the Company with an additional loan capacity of up to $5,000 to fund capital expenditures and improvements at the Grays Harbor facility. Closing is subject to satisfaction of customary closing conditions.

Summary of Significant Accoun26

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2015
Accounting Policies [Abstract]
Restricted Cash	Restricted Cash At June 30, 2015 , current restricted cash was $0 . At December 31, 2014 , current restricted cash was $12,845 , which was held in certificates of deposit as pledges for a letter of credit to support a subsidiary's trade activities and the Company's tender offer to acquire the remaining interest at Petrotec. Non-current restricted cash consists of $101,315 as of June 30, 2015 and December 31, 2014 , respectively, which is held in a certificate of deposit and pledged to Bank of America, who issued a letter of credit on the Company's behalf to support the payments on the Company's GOZone Bonds. In addition, at June 30, 2015 and December 31, 2014 , non-current restricted cash included amounts of $5,500 and $3,500 , respectively, which is held in a certificate of deposit and pledged to Bank of America, who issued a letter of credit to support a subsidiary's trade activities. The Company classifies restricted cash between current and non-current assets based on the length of time of the restricted use.
Accounts Receivable	Accounts Receivable Accounts receivable are carried at invoiced amount less allowance for doubtful accounts. Management estimates the allowance for doubtful accounts based on existing economic conditions, the financial conditions of customers, and the amount and age of past due accounts. Receivables are considered past due if full payment is not received by the contractual due date. Past due accounts are generally written off against the allowance for doubtful accounts only after reasonable collection attempts have been exhausted. At June 30, 2015 , most outstanding receivable amounts related to the 2014 biodiesel mixture excise tax credit reinstatement were received.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment is recorded at cost less accumulated depreciation. Maintenance and repairs are expensed as incurred. Depreciation expense is computed on a straight-line method based upon estimated useful lives of the assets. In April 2015, the Company experienced a fire at its Geismar facility, resulting in the shutdown of the facility. The Company estimated fixed assets of approximately $11,027 were impaired as a result of the fire. As of the date of this report, the Company has recovered an interim receivable amount of $5,000 from insurance for the property damage and believes it is probable that it will recover the remaining costs under its insurance policies. As such, an amount equal to the estimated impairment loss was recorded as part of accounts receivable on the Condensed Consolidated Balance Sheets at June 30, 2015 and no impact on earnings was recognized. The Company intends to file insurance claims under its business interruption policies as a result of the business interruption it experienced in connection with the fire at the Geismar facility. As a result, the full amount of proceeds to be received has not been determined and no amounts related to business interruption insurance have been recognized in earnings at June 30, 2015 .
Goodwill	Goodwill Goodwill is tested for impairment annually on July 31 or when impairment indicators exist. Goodwill is allocated and tested for impairment by reporting units. The analysis is based on a comparison of the carrying value of the reporting unit to its fair value, determined utilizing both a discounted cash flow methodology and a market comparable methodology. The determination of whether or not the asset has become impaired involves a significant level of judgment in the assumptions underlying the approach used to determine the value of the Company’s reporting units. Changes in estimates of future cash flows caused by items such as unforeseen events or sustained unfavorable changes in market conditions could negatively affect the fair value of the reporting unit’s goodwill asset and result in an impairment charge. The 2014 annual impairment test determined that the fair value of the biomass-based diesel reporting unit exceeded its carrying value by approximately 7% and the services reporting unit exceeded its carrying value by approximately 66% . The Company also reviewed goodwill recorded from the acquisitions of LS9, Inc., Syntroleum Corporation and Dynamic Fuels, LLC during the annual impairment testing. There have been no impairment indicators in the first six months of 2015 that indicate an additional assessment needs to be performed.
Share Repurchase Programs	Share Repurchase Programs In February 2015, the Company's board of directors approved a share repurchase program of up to $30,000 of the Company's shares of Common Stock. Shares may be repurchased from time to time in open market transactions, privately negotiated transactions or by other means. The Company accounts for share repurchases using the cost method. Under this method, the cost of the share repurchase is recorded entirely in treasury stock, a contra equity account. During the six months ended June 30, 2015 , the Company repurchased shares of Common Stock in the amount of $11,519 under this share repurchase program.
Foreign Currency Transactions and Translation	Foreign Currency Transactions and Translation The Company’s reporting and functional currency is U.S. dollars. Monetary assets and liabilities denominated in currencies other than U.S. dollars are remeasured into their respective functional currencies at exchange rates in effect at the balance sheet date. The resulting exchange gain or loss is included in the Company’s Condensed Consolidated Statements of Operations as foreign exchange gain (loss) unless the remeasurement gain or loss relates to an intercompany transaction that is of a long-term investment nature and for which settlement is not planned or anticipated in the foreseeable future. Gains or losses arising from translation of such transactions are reported as a component of accumulated other comprehensive income (loss) in the Company’s Condensed Consolidated Balance Sheets. The Company translates the assets and liabilities of its foreign subsidiaries from their respective functional currencies to U.S. dollars at the appropriate spot rates as of the balance sheet date. Generally, our foreign subsidiaries use the local currency as their functional currency. Changes in the carrying value of these assets and liabilities attributable to fluctuations in spot rates are recognized in foreign currency translation adjustment, a component of accumulated other comprehensive income (loss) in the Company’s Condensed Consolidated Balance Sheets.
Income Taxes	Income Taxes The Company uses the asset and liability method to account for income taxes. Accordingly, deferred income taxes are recognized for differences between the financial statement and tax bases of assets and liabilities at enacted statutory tax rates in effect for the years in which differences are expected to reverse. Changes in tax rates are recognized directly to the income statement as they arise. Consideration is given to positive and negative evidence related to the realization of the deferred tax assets and valuation allowances are established to reduce deferred tax assets to the amounts expected to be realized. Significant judgment is required in making this assessment. For uncertain tax positions, the Company recognizes tax benefits that are more likely than not to be sustained upon examination by tax authorities. The amount recognized is measured as the largest amount of benefit that is greater than 50 percent likely to be realized. With regard to non-US subsidiaries, the Company will indefinitely reinvest any future earnings outside of the U.S. and currently does not have any undistributed earnings.
New Accounting Standards	New Accounting Standards In April 2015, the FASB issued ASU 2015-03 simplifying the presentation of debt issuance costs. The amendments in this update require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The guidance in the ASU is effective for financial statements issued for fiscal years beginning after December 15, 2015 and interim periods within fiscal years beginning after December 15, 2016. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements. In July 2015, the FASB decided to defer by one year the effective dates of the new revenue recognition standard as provided by the 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 . Early adoption is permitted for all entities, but not before the original public entity effective date. For public companies, the update will now be effective for interim and annual periods beginning after December 15, 2017. The Company is currently continuing to assess the impact that this guidance will have on its consolidated financial statements.

Acquisitions and Equity Trans27

Acquisitions and Equity Transactions (Tables)	6 Months Ended
	Jun. 30, 2015
Petrotec AG
Business Acquisition [Line Items]
Schedule of Business Acquisitions	The following table summarizes the consideration paid for Petrotec: December 24, 2014 Consideration at fair value for Petrotec: Common stock $ 20,022 The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date. December 24, 2014 Assets (liabilities) acquired of Petrotec: Cash $ 13,523 Accounts receivable 4,989 Inventory 9,470 Other current assets 3,583 Property, plant and equipment 25,026 Total identifiable assets acquired 56,591 Accounts payable (8,171 ) Accrued expenses and other liabilities (2,151 ) Debt (16,192 ) Non-current liabilities (1,462 ) Total liabilities assumed (27,976 ) Net identifiable assets acquired 28,615 Goodwill 369 Non-controlling interest (8,962 ) Net assets acquired $ 20,022

Marketable Securities (Tables)

Marketable Securities (Tables)	6 Months Ended
	Jun. 30, 2015
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, 2015 Maturity Gross Amortized Cost Total Unrealized Gains Total Unrealized Losses Fair Value Commercial paper Within one year $ 6,979 $ 1 $ — $ 6,980 Corporate bonds Within one year 23,032 — (27 ) 23,005 Certificates of deposit Within one year 240 — — 240 Total $ 30,251 $ 1 $ (27 ) $ 30,225 As of December 31, 2014 Maturity Gross Amortized Cost Total Unrealized Gains Total Unrealized Losses Fair Value Corporate bonds Within one year $ 6,781 $ — $ (6 ) $ 6,775 Certificates of deposit Within one year 10,000 — (5 ) 9,995 Total $ 16,781 $ — $ (11 ) $ 16,770

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2015
Inventory Disclosure [Abstract]
Inventories	Inventories consist of the following: June 30, 2015 December 31, 2014 Raw materials $ 37,263 $ 23,117 Work in process 3,132 2,879 Finished goods 54,771 71,512 Total $ 95,166 $ 97,508

Prepaid Expenses and Other As30

Prepaid Expenses and Other Assets (Tables)	6 Months Ended
	Jun. 30, 2015
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: June 30, 2015 December 31, 2014 Commodity derivatives and related collateral, net $ 8,093 $ 12,938 Prepaid expenses 6,650 7,901 Deposits 3,948 4,481 RIN inventory 17,459 10,795 Taxes receivable 2,062 2,843 Other 3,731 4,177 Total $ 41,943 $ 43,135
Summary of other noncurrent assets	Other noncurrent assets consist of the following: June 30, 2015 December 31, 2014 Debt issuance costs (net of accumulated amortization of $1,653 and $1,474, respectively) $ 4,556 $ 5,152 Spare parts inventory 3,410 3,440 Deposits 3,370 4,370 Other 6,242 6,624 Total $ 17,578 $ 19,586

Goodwill (Tables)

Goodwill (Tables)	6 Months Ended
	Jun. 30, 2015
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, 2014 and the changes in goodwill for the six months ended June 30, 2015 : Biomass-based diesel Services Total Balance, December 31, 2014 $ 172,195 $ 16,080 $ 188,275 Finalization of purchase accounting 3,202 — 3,202 Effect of exchange rate changes on goodwill (33 ) — (33 ) Balance, June 30, 2015 $ 175,364 $ 16,080 $ 191,444

Intangible Assets (Tables)

Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Components of Intangible assets	Intangible assets consist of the following: June 30, 2015 Cost Accumulated Amortization Net Weighted Average Remaining Life Raw material supply agreement $ 6,073 $ (1,318 ) $ 4,755 10.5 years Renewable hydrocarbon diesel technology 8,300 (599 ) 7,701 14.0 years Ground lease 200 (104 ) 96 6.4 years Total amortizing intangibles 14,573 (2,021 ) 12,552 In-process research and development, indefinite lives 15,956 — 15,956 Total intangible assets $ 30,529 $ (2,021 ) $ 28,508 December 31, 2014 Cost Accumulated Amortization Net Weighted Average Remaining Life Raw material supply agreement $ 5,914 $ (1,113 ) $ 4,801 11.0 years Renewable hydrocarbon diesel technology 8,300 (323 ) 7,977 14.5 years Ground lease 200 (97 ) 103 6.9 years Total amortizing intangibles 14,414 (1,533 ) 12,881 In-process research and development, indefinite lives 15,956 — 15,956 Total intangible assets $ 30,370 $ (1,533 ) $ 28,837
Estimated amortization expense	The estimated intangible asset amortization expense for fiscal year 2015 through fiscal year 2021 and thereafter is as follows: July 1, 2015 through December 31, 2015 $ 515 2016 1,044 2017 1,058 2018 1,073 2019 1,088 2020 1,104 2021 and thereafter 6,670 Total $ 12,552

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Company's Borrowings	The Company’s debt is as follows: June 30, 2015 December 31, 2014 2.75% Convertible Senior Notes, $143,750 face amount, due in June 2019 $ 123,681 $ 121,354 REG Geismar GOZone bonds, secured, variable interest rate of daily LIBOR, due in October 2033 100,000 100,000 REG Danville term loan, secured, variable interest rate of LIBOR plus 5%, due in December 2017 763 1,513 REG Newton term loan, secured, variable interest rate of LIBOR plus 4%, due in December 2018 18,548 19,868 REG Mason City term loan, fixed interest rate of 5%, due in July 2019 4,126 4,566 REG Ames term loans, secured, fixed interest rates of 3.5% and 4.25%, due in January 2018 and December 2019, respectively 4,065 4,226 Other 1,758 1,402 Total debt $ 252,941 $ 252,929
Revolving Line of Credit	Revolving Lines of Credit June 30, 2015 December 31, 2014 Amount borrowed under revolving lines of credit $ 26,340 $ 16,679 Maximum available to be borrowed under revolving line of credit $ 7,984 $ 20,719

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2015
Related Party Transactions [Abstract]
Summary of Related Party Transactions	The Company reassesses its related parties at reporting dates and has determined that West Central Cooperative (West Central) is no longer a related party as West Central no longer holds ten percent or more of the Company’s outstanding Common Stock nor a board seat on the Company board. Summary of Related Party Balances - Condensed Consolidated Statements of Operations Three Months Three Months Six Months Six Months Cost of goods sold – Biomass-based diesel $ — $ 14,283 $ 4,542 $ 21,429 Selling, general and administrative expenses $ — $ 39 $ — $ 39
Summary of Related Party Balances	Summary of Related Party Balances - Condensed Consolidated Balance Sheets As of As of Accounts receivable $ — $ 36 Accounts payable $ — $ 1,101

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2015
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: June 30, 2015 December 31, 2014 Assets Liabilities Assets Liabilities Gross amounts of derivatives recognized at fair value $ 4,058 $ 594 $ 14,901 $ 205 Cash collateral 4,629 — 2,870 4,628 Total gross amount recognized 8,687 594 17,771 4,833 Gross amounts offset (594 ) (594 ) (4,833 ) (4,833 ) Net amount reported in the condensed consolidated balance sheet $ 8,093 $ — $ 12,938 $ —
Summary of Derivative Financial Instruments by Location of Gain (Loss)	The following table sets forth the commodity contract derivatives gains (losses) included in the Condensed Consolidated Statements of Operations: Location of Gain (Loss) Three Months Three Months Six Months Six Months Commodity derivatives Cost of goods sold – Biomass-based diesel $ (3,570 ) $ (2,744 ) $ (3,990 ) $ (3,438 )

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	6 Months Ended
	Jun. 30, 2015
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, 2015 Total Level 1 Level 2 Level 3 Money market funds $ 1,690 $ 1,690 $ — $ — Certificates of deposit 240 — 240 — Commercial paper 6,980 — 6,980 — Commercial notes/bonds 23,005 — 23,005 — Commodity contract derivatives 3,464 847 2,617 — Contingent consideration for LS9 acquisition (6,159 ) — — (6,159 ) Contingent consideration for Dynamic Fuels acquisition (29,337 ) — — (29,337 ) $ (117 ) $ 2,537 $ 32,842 $ (35,496 ) As of December 31, 2014 Total Level 1 Level 2 Level 3 Money market funds $ 302 $ 302 $ — $ — Certificates of deposit 9,995 — 9,995 — Commercial notes/bond 6,775 — 6,775 — Commodity contract derivatives 14,696 6,885 7,811 — Contingent consideration for LS9 acquisition (8,624 ) — — (8,624 ) Contingent consideration of Dynamic Fuels acquisition (30,695 ) — — (30,695 ) $ (7,551 ) $ 7,187 $ 24,581 $ (39,319 )
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 Balance at beginning of period, January 1, 2015 $ 8,624 $ 30,695 Change in estimates included in earnings (31 ) 324 Settlements — (1,052 ) Balance at end of period, March 31, 2015 8,593 29,967 Change in estimates included in earnings (2,434 ) 313 Settlements — (943 ) Balance at end of period, June 30, 2015 $ 6,159 $ 29,337 Contingent Consideration for LS9 Acquisition Contingent Consideration for Dynamic Fuels Acquisition Balance at beginning of period, January 1, 2014 $ — $ — Fair value of contingent consideration at measurement date 17,050 — Balance at end of period, March 31, 2014 17,050 — Fair value of contingent consideration at measurement date — 28,900 Change in estimates included in earnings (384 ) — Settlements — — Balance at end of period, 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, 2015 As of December 31, 2014 Asset (Liability) Fair Value Asset (Liability) Fair Value Financial liabilities: Debt and lines of credit $ (279,281 ) $ (276,788 ) $ (269,608 ) $ (270,331 )

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	6 Months Ended
	Jun. 30, 2015
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 (loss) per share attributable to common stockholders during the periods presented as the effect was anti-dilutive: Three Months Three Months Six Months Six Months Options to purchase common stock 87,026 87,026 87,026 87,026 Stock appreciation rights 2,433,636 1,129,018 2,119,168 1,389,189 Warrants to purchase common stock — 17,916 — 17,916 Convertible notes 10,838,218 5,419,109 10,838,218 5,419,109 Total 13,358,880 6,653,069 13,044,412 6,913,240
Calculation of diluted net income per share	The following table presents the calculation of diluted net loss per share: Three Months Three Months Six Months Six Months Net income (loss) attributable to the Company’s common stockholders - Basic $ (2,001 ) $ 10,835 $ (40,108 ) $ 8,858 Plus: distributed dividends to Preferred Stockholders — — — 40 Less: effect of participating securities — — — (406 ) Net income (loss) attributable to common stockholders - Dilutive $ (2,001 ) $ 10,835 $ (40,108 ) $ 8,492 Shares: Weighted-average shares used to compute basic net income (loss) per share 43,736,366 39,939,346 44,048,017 39,119,430 Adjustment to reflect stock appreciation right conversions — 15,241 — 9,706 Weighted-average shares used to compute diluted net income (loss) per share 43,736,366 39,954,587 44,048,017 39,129,136 Net income (loss) per share attributable to common stockholders: Diluted $ (0.05 ) $ 0.27 $ (0.91 ) $ 0.22

Reportable Segments (Tables)

Reportable Segments (Tables)	6 Months Ended
	Jun. 30, 2015
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 Net revenues: Biomass-based diesel $ 373,733 $ 332,859 $ 604,547 $ 551,871 Services 31,489 26,066 50,300 46,590 Intersegment revenues (31,460 ) (26,007 ) (50,167 ) (46,503 ) $ 373,762 $ 332,918 $ 604,680 $ 551,958 Income (loss) before income taxes: Biomass-based diesel $ 11,511 $ 15,114 $ (8,588 ) $ 26,675 Services 6 37 49 40 Corporate and other (a) (14,387 ) (16,063 ) (33,532 ) (30,093 ) $ (2,870 ) $ (912 ) $ (42,071 ) $ (3,378 ) Depreciation and amortization expense, net: Biomass-based diesel $ 5,450 $ 2,836 $ 10,658 $ 5,425 Services 76 52 138 93 Corporate and other (a) 708 268 1,164 521 $ 6,234 $ 3,156 $ 11,960 $ 6,039 Cash paid for purchases of property, plant and equipment: Biomass-based diesel $ 15,055 $ 18,352 $ 25,545 $ 30,906 Services 403 631 1,125 631 Corporate and other (a) 72 554 1,037 773 $ 15,530 $ 19,537 $ 27,707 $ 32,310 As of As of Assets: Biomass-based diesel $ 912,649 $ 899,211 Services 21,476 20,750 Corporate and other (b) 219,279 452,927 $ 1,153,404 $ 1,372,888 (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.
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas	Long-lived assets represent the net book value of property, plant and equipment. Three Months Three Months Six Months Six Months Net revenues: United States $ 335,681 $ 332,918 $ 536,606 $ 551,958 Foreign 38,081 — 68,074 — $ 373,762 $ 332,918 $ 604,680 $ 551,958 As of June 30, 2015 As of December 31, 2014 Long-lived assets: United States $ 478,320 $ 468,170 Foreign 22,196 25,026 $ 500,516 $ 493,196

Basis of Presentation and Nat39

Basis of Presentation and Nature of the Business (Details) - Jun. 30, 2015 gal in Millions	facilitybiorefinerygal
Class of Stock [Line Items]
Number of operating biodiesel production facilities | facility	9
Production capacity per year | gal	332
Petrotec AG
Class of Stock [Line Items]
Number of biorefineries	2

Summary of Significant Accoun40

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended	4 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Aug. 06, 2015	Jun. 30, 2015	Dec. 31, 2014	Feb. 28, 2015
Business Acquisition [Line Items]
Current restricted cash	$ 0		$ 0	$ 12,845
Restricted cash	106,815		106,815	$ 104,815
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss	11,027
Share repurchase program, amount authorized to be repurchased					$ 30,000
Share repurchased program, amount repurchased			11,519
Biomass-based diesel
Business Acquisition [Line Items]
Minimum percentage of increase in fair value of goodwill over carrying value				7.00%
Services
Business Acquisition [Line Items]
Minimum percentage of increase in fair value of goodwill over carrying value				66.00%
Subsequent Event
Business Acquisition [Line Items]
Insurance Recoveries		$ 5,000
REG Geismar GOZone bonds
Business Acquisition [Line Items]
Restricted cash	101,315		101,315	$ 101,315
REG Energy Services
Business Acquisition [Line Items]
Restricted cash	$ 5,500		$ 5,500	$ 3,500

Acquisitions and Equity Trans41

Acquisitions and Equity Transactions (Details Textual) - USD ($) $ in Thousands	Dec. 24, 2014	Dec. 31, 2014	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition [Line Items]
Issuance of common stock for acquisitions				$ 61,085
Goodwill		$ 188,275	$ 191,444
Petrotec AG
Business Acquisition [Line Items]
Equity interest	69.08%		84.91%
Issuance of common stock for acquisitions	$ 20,022
Shares of common stock issued	2,070,538
Cash			$ 4,171
Goodwill	$ 369
Noncontrolling interest percent		30.92%
Fair value of noncontrolling interest	$ 8,962	$ 8,962
Acquisition related costs		$ 1,289

Acquisitions and Equity Trans42

Acquisitions and Equity Transactions (Details) - USD ($) $ in Thousands	Dec. 24, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Common stock			$ 61,085
Assets (liabilities) acquired:
Debt			$ (113,553)
Goodwill		$ 191,444		$ 188,275
Petrotec AG
Business Acquisition [Line Items]
Common stock	$ 20,022
Assets (liabilities) acquired:
Cash	13,523
Accounts receivable	4,989
Inventory	9,470
Other current assets	3,583
Property, plant and equipment	25,026
Total identifiable assets acquired	56,591
Accounts payable	(8,171)
Other current liabilities	(2,151)
Debt	(16,192)
Other noncurrent liabilities	(1,462)
Total liabilities assumed	(27,976)
Net identifiable assets acquired	28,615
Goodwill	369
Non-controlling interest	(8,962)			$ (8,962)
Net assets acquired	$ 20,022

Marketable Securities (Details)

Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Cost	$ 30,251	$ 16,781
Total Unrealized Gains	1	0
Total Unrealized Losses	(27)	(11)
Fair Value	30,225	16,770
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Cost	6,979
Total Unrealized Gains	1
Total Unrealized Losses	0
Fair Value	6,980
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Cost	23,032	6,781
Total Unrealized Gains	0	0
Total Unrealized Losses	(27)	(6)
Fair Value	23,005	6,775
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Cost	240	10,000
Total Unrealized Gains	0	0
Total Unrealized Losses	0	(5)
Fair Value	$ 240	$ 9,995

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Inventories
Raw materials	$ 37,263	$ 23,117
Work in process	3,132	2,879
Finished goods	54,771	71,512
Total	$ 95,166	$ 97,508

Prepaid Expenses and Other As45

Prepaid Expenses and Other Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Summary of prepaid expense and other assets
Commodity derivatives and related collateral, net	$ 8,093	$ 12,938
Prepaid expenses	6,650	7,901
Deposits	3,948	4,481
RIN inventory	17,459	10,795
Taxes receivable	2,062	2,843
Other	3,731	4,177
Total	$ 41,943	$ 43,135

Prepaid Expenses and Other As46

Prepaid Expenses and Other Assets (Details Textual) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Other Assets [Abstract]
Inventory reduced to lower of cost or market	$ 695	$ 1,042
Accumulated amortization, debt issuance costs	$ 1,653	$ 1,474

Prepaid Expenses and Other As47

Prepaid Expenses and Other Assets (Details 1) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Debt issuance costs (net of accumulated amortization of $1,653 and $1,474, respectively)	$ 4,556	$ 5,152
Spare parts inventory	3,410	3,440
Deposits	3,370	4,370
Other	6,242	6,624
Total	$ 17,578	$ 19,586

Goodwill (Details)

Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2015USD ($)
Goodwill [Roll Forward]
Balance	$ 188,275
Finalization of purchase accounting	3,202
Effect of exchange rate changes on goodwill	(33)
Balance	191,444
Biomass-based diesel
Goodwill [Roll Forward]
Balance	172,195
Finalization of purchase accounting	3,202
Effect of exchange rate changes on goodwill	(33)
Balance	175,364
Services
Goodwill [Roll Forward]
Balance	16,080
Finalization of purchase accounting	0
Effect of exchange rate changes on goodwill	0
Balance	$ 16,080

Intangible Assets (Details)

Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	$ 14,573	$ 14,414
Accumulated Amortization, finite-lived	(2,021)	(1,533)
Total	12,552	12,881
Cost, indefinite lived	30,529	30,370
Accumulated Amortization, indefinite-lived	(2,021)	(1,533)
Net, indefinite-lived	28,508	28,837
In-process research and development, indefinite lives
Finite-Lived Intangible Assets [Line Items]
Cost, indefinite lived	15,956	15,956
Accumulated Amortization, indefinite-lived	0	0
Net, indefinite-lived	15,956	15,956
Raw material supply agreement
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	6,073	5,914
Accumulated Amortization, finite-lived	(1,318)	(1,113)
Total	$ 4,755	$ 4,801
Weighted Average Remaining Life	10 years 6 months	11 years
Renewable hydrocarbon diesel technology
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	$ 8,300	$ 8,300
Accumulated Amortization, finite-lived	(599)	(323)
Total	$ 7,701	$ 7,977
Weighted Average Remaining Life	14 years	14 years 6 months
Ground lease
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	$ 200	$ 200
Accumulated Amortization, finite-lived	(104)	(97)
Total	$ 96	$ 103
Weighted Average Remaining Life	6 years 4 months 24 days	6 years 10 months 24 days

Intangible Assets (Details Text

Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible amortization expense	$ 252	$ 93	$ 489	$ 177

Intangible Assets (Details 1)

Intangible Assets (Details 1) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Estimated amortization expense
July 1, 2015 through December 31, 2015	$ 515
2,016	1,044
2,017	1,058
2,018	1,073
2,019	1,088
2,020	1,104
2021 and thereafter	6,670
Total	$ 12,552	$ 12,881

Debt (Details)

Debt (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Company's borrowings
Total notes payable	$ 252,941	$ 252,929
Convertible Senior Notes
Line of Credit Facility [Line Items]
Interest rate	2.75%	2.75%
Face amount	$ 143,750	$ 143,750
Company's borrowings
Total notes payable	123,681	121,354
REG Geismar GOZone bonds
Company's borrowings
Total notes payable	$ 100,000	$ 100,000
REG Danville term loan
Line of Credit Facility [Line Items]
Description of variable rate basis	LIBOR plus 5% per annum	LIBOR plus 5% per annum
Company's borrowings
Total notes payable	$ 763	$ 1,513
REG Danville term loan | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate	5.00%	5.00%
REG Newton term loan
Line of Credit Facility [Line Items]
Description of variable rate basis	LIBOR plus 4% per annum	LIBOR plus 4% per annum
Company's borrowings
Total notes payable	$ 18,548	$ 19,868
REG Newton term loan | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate	4.00%	4.00%
REG Mason City term loan
Line of Credit Facility [Line Items]
Interest rate	5.00%	5.00%
Company's borrowings
Total notes payable	$ 4,126	$ 4,566
REG Ames term loans
Company's borrowings
Total notes payable	$ 4,065	$ 4,226
REG Ames term loans | Minimum
Line of Credit Facility [Line Items]
Interest rate	3.50%	3.50%
REG Ames term loans | Maximum
Line of Credit Facility [Line Items]
Interest rate	4.25%	4.25%
Other
Company's borrowings
Total notes payable	$ 1,758	$ 1,402

Debt (Details 1)

Debt (Details 1) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Amount borrowed under revolving lines of credit	$ 26,340	$ 16,679
Maximum available to be borrowed under revolving line of credit	$ 7,984	$ 20,719

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Related Party Transactions [Abstract]
Cost of goods sold – Biomass-based diesel	$ 0	$ 14,283	$ 4,542	$ 21,429
Selling, general and administrative expenses	$ 0	$ 39	$ 0	$ 39

Related Party Transactions (D55

Related Party Transactions (Details 1) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Related Party Transactions [Abstract]
Accounts receivable	$ 0	$ 36
Accounts payable	$ 0	$ 1,101

Derivative Instruments (Details

Derivative Instruments (Details Textual)	Jun. 30, 2015Contract
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Open commodity contracts	3,655

Derivative Instruments (Detai57

Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets
Gross amounts of derivatives recognized at fair value	$ 4,058	$ 14,901
Cash collateral	4,629	2,870
Total gross amount recognized	8,687	17,771
Gross amounts offset	(594)	(4,833)
Net amount reported in the condensed consolidated balance sheet	8,093	12,938
Liabilities
Gross amounts of derivatives recognized at fair value	594	205
Cash collateral	0	4,628
Total gross amount recognized	594	4,833
Gross amounts offset	(594)	(4,833)
Net amount reported in the condensed consolidated balance sheet	$ 0	$ 0

Derivative Instruments (Detai58

Derivative Instruments (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
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	$ (3,570)	$ (2,744)	$ (3,990)	$ (3,438)

Fair Value Measurement (Details

Fair Value Measurement (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets (liabilities) measured at fair value
Total, fair value	$ (117)	$ (7,551)
Level 1
Assets (liabilities) measured at fair value
Total, fair value	2,537	7,187
Level 2
Assets (liabilities) measured at fair value
Total, fair value	32,842	24,581
Level 3
Assets (liabilities) measured at fair value
Total, fair value	(35,496)	(39,319)
Commodity contract derivatives
Assets (liabilities) measured at fair value
Assets, fair value	3,464	14,696
Commodity contract derivatives | Level 1
Assets (liabilities) measured at fair value
Assets, fair value	847	6,885
Commodity contract derivatives | Level 2
Assets (liabilities) measured at fair value
Assets, fair value	2,617	7,811
Commodity contract derivatives | Level 3
Assets (liabilities) measured at fair value
Assets, fair value	0	0
Contingent consideration for acquisition | LS9, Inc.
Assets (liabilities) measured at fair value
Liabilities, fair value	(6,159)	(8,624)
Contingent consideration for acquisition | LS9, Inc. | Level 1
Assets (liabilities) measured at fair value
Liabilities, fair value	0	0
Contingent consideration for acquisition | LS9, Inc. | Level 2
Assets (liabilities) measured at fair value
Liabilities, fair value	0	0
Contingent consideration for acquisition | LS9, Inc. | Level 3
Assets (liabilities) measured at fair value
Liabilities, fair value	(6,159)	(8,624)
Contingent consideration for acquisition | Dynamic Fuels, LLC
Assets (liabilities) measured at fair value
Liabilities, fair value	(29,337)	(30,695)
Contingent consideration for acquisition | Dynamic Fuels, LLC | Level 1
Assets (liabilities) measured at fair value
Liabilities, fair value	0	0
Contingent consideration for acquisition | Dynamic Fuels, LLC | Level 2
Assets (liabilities) measured at fair value
Liabilities, fair value	0	0
Contingent consideration for acquisition | Dynamic Fuels, LLC | Level 3
Assets (liabilities) measured at fair value
Liabilities, fair value	(29,337)	(30,695)
Money market funds
Assets (liabilities) measured at fair value
Assets, fair value	1,690	302
Money market funds | Level 1
Assets (liabilities) measured at fair value
Assets, fair value	1,690	302
Money market funds | Level 2
Assets (liabilities) measured at fair value
Assets, fair value	0	0
Money market funds | Level 3
Assets (liabilities) measured at fair value
Assets, fair value	0	0
Certificates of deposit
Assets (liabilities) measured at fair value
Assets, fair value	240	9,995
Certificates of deposit | Level 1
Assets (liabilities) measured at fair value
Assets, fair value	0	0
Certificates of deposit | Level 2
Assets (liabilities) measured at fair value
Assets, fair value	240	9,995
Certificates of deposit | Level 3
Assets (liabilities) measured at fair value
Assets, fair value	0	0
Commercial paper
Assets (liabilities) measured at fair value
Assets, fair value	6,980
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	6,980
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	23,005	6,775
Commercial notes/bonds | Level 1
Assets (liabilities) measured at fair value
Assets, fair value	0	0
Commercial notes/bonds | Level 2
Assets (liabilities) measured at fair value
Assets, fair value	23,005	6,775
Commercial notes/bonds | Level 3
Assets (liabilities) measured at fair value
Assets, fair value	$ 0	$ 0

Fair Value Measurement (Detai60

Fair Value Measurement (Details 1) - Contingent Consideration for Acquisition - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2014
LS9, Inc.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 8,593	$ 8,624	$ 17,050	$ 0
Change in estimates included in earnings	(2,434)	(31)	(384)
Fair value of contingent consideration at measurement date			0	17,050
Settlements	0	0	0
Ending balance	6,159	8,593	16,666	17,050
Dynamic Fuels, LLC
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	29,967	30,695	0	0
Change in estimates included in earnings	313	324	0
Fair value of contingent consideration at measurement date			28,900	0
Settlements	(943)	(1,052)	0
Ending balance	$ 29,337	$ 29,967	$ 28,900	$ 0

Fair Value Measurement (Detai61

Fair Value Measurement (Details 2) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Asset (Liability) Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt and lines of credit	$ (279,281)	$ (269,608)
Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt and lines of credit	$ (276,788)	$ (270,331)

Fair Value Measurement (Detai62

Fair Value Measurement (Details Textual)	6 Months Ended
	Jun. 30, 2015
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 (Loss) Per Share (De

Net Income (Loss) Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	13,358,880,000	6,653,069,000	13,044,412	6,913,240
Stock appreciation rights
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	2,433,636,000	1,129,018,000	2,119,168	1,389,189
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	87,026,000	87,026,000	87,026	87,026
Warrants to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	0	17,916,000	0	17,916
Convertible notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	10,838,218,000	5,419,109,000	10,838,218	5,419,109

Net Income (Loss) Per Share (64

Net Income (Loss) Per Share (Details 1) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY’S COMMON STOCKHOLDERS	$ (2,001)	$ 10,835	$ (40,108)	$ 8,858
Plus: distributed dividends to Preferred Stockholders	0	0	0	40
Less: effect of participating securities	0	0	0	(406)
Net income (loss) attributable to common stockholders - Dilutive	$ (2,001)	$ 10,835	$ (40,108)	$ 8,492
Weighted-average shares used to compute basic net income (loss) per share	43,736,366	39,939,346	44,048,017	39,119,430
Adjustment to reflect stock appreciation right conversions	0	15,241	0	9,706
Weighted-average shares used to compute diluted net income (loss) per share	43,736,366	39,954,587	44,048,017	39,129,136
Diluted	$ (0.05)	$ 0.27	$ (0.91)	$ 0.22

Reportable Segments (Details)

Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net revenues:		$ 373,762	$ 332,918	$ 604,680	$ 551,958
Income (loss) before income taxes:		(2,870)	(912)	(42,071)	(3,378)
Depreciation and amortization expense, net:		6,234	3,156	11,960	6,039
Cash paid for purchases of property, plant and equipment:		15,530	19,537	27,707	32,310
Assets:		1,153,404		1,153,404		$ 1,372,888
Intersegment revenues
Segment Reporting Information [Line Items]
Net revenues:		(31,460)	(26,007)	(50,167)	(46,503)
Corporate and other
Segment Reporting Information [Line Items]
Income (loss) before income taxes:	[1]	(14,387)	(16,063)	(33,532)	(30,093)
Depreciation and amortization expense, net:	[1]	708	268	1,164	521
Cash paid for purchases of property, plant and equipment:	[1]	72	554	1,037	773
Assets:	[2]	219,279		219,279		452,927
Biomass-based diesel | Segments
Segment Reporting Information [Line Items]
Net revenues:		373,733	332,859	604,547	551,871
Income (loss) before income taxes:		11,511	15,114	(8,588)	26,675
Depreciation and amortization expense, net:		5,450	2,836	10,658	5,425
Cash paid for purchases of property, plant and equipment:		15,055	18,352	25,545	30,906
Assets:		912,649		912,649		899,211
Services | Segments
Segment Reporting Information [Line Items]
Net revenues:		31,489	26,066	50,300	46,590
Income (loss) before income taxes:		6	37	49	40
Depreciation and amortization expense, net:		76	52	138	93
Cash paid for purchases of property, plant and equipment:		403	$ 631	1,125	$ 631
Assets:		$ 21,476		$ 21,476		$ 20,750
[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.

Reportable Segments (Details 1)

Reportable Segments (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues:	$ 373,762	$ 332,918	$ 604,680	$ 551,958
Long-lived assets:	500,516		500,516		$ 493,196
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues:	335,681	332,918	536,606	551,958
Long-lived assets:	478,320		478,320		468,170
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues:	38,081	$ 0	68,074	$ 0
Long-lived assets:	$ 22,196		$ 22,196		$ 25,026

Subsequent Events (Details)

Subsequent Events (Details) gal in Millions	Jul. 31, 2015USD ($)$ / galsharesgal	Jul. 16, 2015USD ($)	Jun. 30, 2015USD ($)gal	Jun. 30, 2014USD ($)
Subsequent Event [Line Items]
Production capacity per year | gal			332
Debt assumed in acquisition				$ 113,553,000
Wells Fargo Revolver
Subsequent Event [Line Items]
Unused line fee			0.50%
Wells Fargo Revolver | Revolving Loan Commitments
Subsequent Event [Line Items]
Maximum borrowing capacity			$ 40,000,000
Wells Fargo Revolver | Letter of Credit
Subsequent Event [Line Items]
Maximum borrowing capacity			$ 10,000,000
Subsequent Event | Imperium
Subsequent Event [Line Items]
Production capacity per year | gal	100
Cash	$ 15,000,000
Shares of common stock issued | shares	1,500,000
Period for payment	2 years
Payment for biomass-based diesel produced and sold | $ / gal	0.05
Net working capital value	$ 25,000,000
Cash paid at closing	$ 1,750,000
Shares of common stock issued at closing | shares	175,000
Debt assumed in acquisition	$ 5,200,000
Subsequent Event | Wells Fargo Revolver
Subsequent Event [Line Items]
Unused line fee		0.375%
Subsequent Event | Wells Fargo Revolver | Revolving Loan Commitments
Subsequent Event [Line Items]
Maximum borrowing capacity		$ 60,000,000
Subsequent Event | Wells Fargo Revolver | Letter of Credit
Subsequent Event [Line Items]
Maximum borrowing capacity		$ 25,000,000
Subsequent Event | Umpqua Bank | Imperium
Subsequent Event [Line Items]
Maximum borrowing capacity	$ 5,000,000