Renewable Energy (REGI) 10-Q 9 May 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 29, 2016
Document Document And Entity Information [Abstract]
Entity Registrant Name	Renewable Energy Group, Inc.
Entity Central Index Key	1,463,258
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		43,716,170

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 164,052	$ 47,081
Accounts receivable, net	106,350	310,731
Inventories	133,781	85,890
Prepaid expenses and other assets	43,273	31,882
Total current assets	447,456	475,584
Property, plant and equipment, net	600,530	574,584
Goodwill	16,080	16,080
Intangible assets, net	30,624	30,941
Investments	12,180	8,797
Other assets	11,672	11,819
Restricted cash	105,815	105,815
TOTAL ASSETS	1,224,357	1,223,620
CURRENT LIABILITIES:
Lines of credit	2,864	23,149
Current maturities of long-term debt	9,109	5,206
Accounts payable	246,580	236,817
Accrued expenses and other liabilities	28,192	28,799
Total current liabilities	286,745	293,971
Unfavorable lease obligation	16,886	17,343
Deferred income taxes	19,020	19,186
Contingent consideration for acquisitions	28,890	26,949
Long-term debt (net of debt issuance costs of $3,817 and $4,105, respectively)	251,154	247,251
Other liabilities	4,856	4,910
Total liabilities	$ 607,551	$ 609,610
COMMITMENTS AND CONTINGENCIES
EQUITY:
Common stock ($.0001 par value; 300,000,000 shares authorized; 43,723,893 and 43,837,714 shares outstanding, respectively)	$ 5	$ 4
Common stock—additional paid-in-capital	479,808	474,367
Retained earnings	171,336	169,680
Accumulated other comprehensive loss	(2,430)	(4,009)
Treasury stock (3,826,166 and 3,178,372 shares outstanding, respectively)	(34,579)	(28,762)
Total equity attributable to the Company's shareholders	614,140	611,280
Non-controlling interest	2,666	2,730
Total equity	616,806	614,010
TOTAL LIABILITIES AND EQUITY	$ 1,224,357	$ 1,223,620

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Less: Debt issuance costs (net of accumulated amortization of $2,515 and $2,296, respectively	$ 3,817	$ 4,105
Common stock, par or stated value per share (in usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares, outstanding (in shares)	43,723,893	43,837,714
Treasury stock, shares outstanding (in shares)	3,826,166	3,178,372

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
REVENUES:
Biomass-based diesel sales	$ 247,164	$ 221,026
Biomass-based diesel government incentives	58,401	9,788
Total biodiesel sales	305,565	230,814
Services	29	104
Total revenues	305,594	230,918
COSTS OF GOODS SOLD:
Biomass-based diesel	280,484	242,510
Biomass-based diesel—related parties	0	4,542
Services	2	61
Total cost of goods sold	280,486	247,113
GROSS PROFIT (LOSS)	25,108	(16,195)
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	19,777	16,675
RESEARCH AND DEVELOPMENT EXPENSE	3,926	3,860
GAIN ON INVOLUNTARY CONVERSION	(3,543)	0
INCOME (LOSS) FROM OPERATIONS	4,948	(36,730)
OTHER INCOME (EXPENSE), NET:
Other income (loss), net	(73)	272
Interest expense	(3,311)	(2,743)
Total other income (expenses)	(3,384)	(2,471)
INCOME (LOSS) BEFORE INCOME TAXES	1,564	(39,201)
INCOME TAX BENEFIT	122	897
NET INCOME (LOSS)	1,686	(38,304)
LESS—NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTEREST	30	(197)
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY	1,656	(38,107)
LESS—EFFECT OF PARTICIPATING SHARE-BASED AWARDS	(24)	0
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY’S COMMON STOCKHOLDERS	$ 1,632	$ (38,107)
NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS:
BASIC (in dollars per share)	$ 0.04	$ (0.86)
DILUTED (in dollars per share)	$ 0.04	$ (0.86)
WEIGHTED AVERAGE SHARES USED TO COMPUTE NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS:
BASIC (in shares)	43,899,084	44,362,637
DILUTED (in shares)	43,899,084	44,362,637

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,686	$ (38,304)
Unrealized gains (losses) on marketable securities, net of taxes of $0 and $0, respectively	0	9
Foreign currency translation adjustments	1,664	(4,641)
Other comprehensive income (loss)	1,664	(4,632)
Comprehensive income (loss)	3,350	(42,936)
Less—Comprehensive income (loss) attributable to noncontrolling interest	85	0
Comprehensive income (loss) attributable to the Company	$ 3,265	$ (42,936)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Taxes on unrealized losses on marketable securities	$ 0	$ 0

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Common Stock - Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interest
Beginning Balance at Dec. 31, 2014	$ 778,662	$ 4	$ 453,109	$ 321,083	$ (11)	$ (4,412)	$ 8,889
Beginning Balance, shares at Dec. 31, 2014		44,422,881
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	412		412
Issuance of common stock, shares		37,966
Treasury stock purchases	(5,000)					(5,000)
Treasury stock purchases, shares		(525,281)
Acquisition of noncontrolling interest	(4,064)						(4,064)
Stock compensation expense	1,080		1,080
Other comprehensive income	(4,632)				(4,632)
Net income (loss)	(38,304)			(38,107)			(197)
Ending Balance at Mar. 31, 2015	728,154	$ 4	454,601	282,976	(4,643)	(9,412)	4,628
Ending Balance, Shares at Mar. 31, 2015		43,935,566
Beginning Balance at Dec. 31, 2015	614,010	$ 4	474,367	169,680	(4,009)	(28,762)	2,730
Beginning Balance, shares at Dec. 31, 2015		43,837,714
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	316		316
Issuance of common stock, shares		33,973
Issuance of common stock in acquisition	4,050	$ 1	4,049
Issuance of common stock in acquisition, shares		500,000
Treasury stock purchases	(5,817)					(5,817)
Treasury stock purchases, shares		(647,794)
Acquisition of noncontrolling interest	(179)						(179)
Stock compensation expense	1,076		1,076
Other comprehensive income	1,664				1,579		85
Net income (loss)	1,686			1,656			30
Ending Balance at Mar. 31, 2016	$ 616,806	$ 5	$ 479,808	$ 171,336	$ (2,430)	$ (34,579)	$ 2,666
Ending Balance, Shares at Mar. 31, 2016		43,723,893

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 1,686	$ (38,304)
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Depreciation expense	7,674	5,613
Amortization expense of assets and liabilities, net	161	113
Gain on involuntary conversion	(3,543)	0
Accretion of convertible note discount	1,203	1,158
Change in fair value of contingent consideration	(15)	293
Provision for doubtful accounts	(160)	(816)
Stock compensation expense	1,076	1,080
Deferred tax benefit	(166)	(938)
Other operating activities	(117)	199
Changes in asset and liabilities, net of effects from acquisitions:
Accounts receivable, net	204,628	242,572
Inventories	(45,789)	(24,123)
Prepaid expenses and other assets	(10,817)	4,508
Accounts payable	10,008	(20,482)
Accrued expenses and other liabilities	(2,543)	(6,851)
Net cash flows provided by operating activities	163,286	164,022
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash received from maturities of marketable securities	0	13,733
Cash receipts for involuntary conversion	3,543	0
Transfer out of restricted cash	0	12,845
Cash paid for purchase of property, plant and equipment	(14,770)	(12,178)
Cash paid for acquisitions and additional interests, net of cash acquired	(12,720)	(4,064)
Cash paid for investments	(3,249)	0
Net cash flows provided by (used in) investing activities	(27,196)	10,336
CASH FLOWS FROM FINANCING ACTIVITIES:
Net repayments on Wells Fargo Revolver	(23,149)	(15,325)
Borrowings on other lines of credits	2,820	0
Cash received from notes payable	7,537	0
Cash paid on notes payable	(1,312)	(1,317)
Cash paid for debt issuance costs	(112)	(317)
Cash paid for treasury stock	(4,873)	(5,000)
Cash paid for contingent consideration settlement	(581)	(1,052)
Net cash flows used in financing activities	(19,670)	(23,011)
NET CHANGE IN CASH AND CASH EQUIVALENTS	116,420	151,347
CASH AND CASH EQUIVALENTS, Beginning of period	47,081	63,516
Effect of exchange rate changes on cash	551	(1,318)
CASH AND CASH EQUIVALENTS, End of period	164,052	213,545
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION:
Cash paid for income taxes	122	0
Cash paid for interest	1,027	715
Amounts included in period-end accounts payable for:
Purchases of property, plant and equipment	6,224	3,511
Debt issuance cost	50	28
Incentive stock liability for raw material supply agreement	0	70
Treasury stock	944	0
Issuance of common stock for acquisitions	4,050	0
Contingent consideration for acquisitions	$ 4,500	$ 0

Basis of Presentation and Natur

Basis of Presentation and Nature of the Business	3 Months Ended
	Mar. 31, 2016
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" or "REG"), 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 14, 2016. 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 March 31, 2016 , the Company operates a network of twelve biorefineries in North America, which includes eleven operating biomass-based diesel production facilities with aggregate nameplate production capacity of 452 million gallons per year, or mmgy, along with a fermentation facility. The Company's network includes the addition of a 20 -million gallon nameplate capacity biomass-based diesel refinery located in DeForest, Wisconsin resulting from its acquisition of the biorefinery and related assets of Sanimax Energy, LLC ("Sanimax Energy") in March 2016. 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 mixture excise tax credit (the "BTC") is in effect throughout 2016 and will expire on December 31, 2016. It is uncertain whether the BTC will be reinstated thereafter. The expiration 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	3 Months Ended
	Mar. 31, 2016
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, 2015 . There have been no material changes from the policies previously disclosed other than those noted below. 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 March 31, 2016 , over $231,000 of the receivable amounts outstanding at December 31, 2015 related to the 2015 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 with a net book value of approximately $11,027 were impaired as a result of the fire. As of the date of this report, the Company has received property insurance proceeds of $14,570 , of which $11,027 was related to the property damage. The excess of the property insurance proceeds over the net book value of the impaired assets, $3,543 , was recorded as gain on involuntary conversion on the Condensed Consolidated Statements of Operations during the three months ended March 31, 2016. In September 2015, another fire occurred at the Geismar facility. The Company estimated fixed assets with a net book value of approximately $1,414 were impaired by the September fire. The Company believes it is probable that it will recover all the net book value of the assets damaged by the fire under its insurance policies. As such, a receivable was recorded as an offset to the estimated impairment loss. No impact on earnings was recognized. 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. At March 31, 2016 and December 31, 2015, the Company had goodwill in only one of its reporting units: Services. The annual impairment test at July 31, 2015 determined that the fair value of the Services reporting unit exceeded its carrying value by approximately 21% . The interim goodwill impairment test as of October 31, 2015 determined that the fair value of the Services reporting unit exceeded its carrying value by 24% . There have been no impairment indicators in the first three months of 2016 that would 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. The program is in effect through October 31, 2016. 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 three months ended March 31, 2016 , the Company repurchased shares of Common Stock in the amount of $5,817 , of which $944 was paid after March 31, 2016 under this share repurchase program. In March 2016, the Company's board of directors approved a repurchase program of up to $50,000 of the Company's shares of common stock and/or convertible notes, in effect through March 5, 2018. Under the program, which is in addition to the $30,000 common stock repurchase program announced in February 2015, the Company may repurchase shares or bonds from time to time in open market transactions, privately negotiated transactions or by other means. The timing and amount of repurchase transactions will be determined by the Company's management based on its evaluation of market conditions, share price, bond price, legal requirements and other factors. No shares or convertible notes were repurchased under this program during the three months ended March 31, 2016. New Accounting Standards In March 2016, the FASB issued ASU 2016-08, "Revenue from Contracts with Customers (Topic 606): Principal versus Agent Consideration (Reporting Revenue Gross versus Net)" that clarifies how an entity should identify the unit of accounting for the principal versus agent evaluation and how it should apply the control principle to certain types of arrangements, such as service transactions. The guidance also re-frames the indicators to focus on evidence that an entity is acting as a principal rather than an agent. The guidance is effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company is evaluating the impact this guidance will have on its consolidated financial statements. In March 2016, the FASB issued ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting”. The amendments in this updated guidance include changes to simplify the codification for several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. For public entities, this guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within that reporting period. Early adoption is permitted. The Company is evaluating the impact this new guidance will have on its consolidated financial statements.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2016
Business Combinations [Abstract]
Acquisitions	ACQUISITIONS Sanimax Energy, LLC On March 15, 2016, the Company acquired fixed assets and inventory from Sanimax Energy, including the 20 mmgy nameplate capacity biomass-based refinery in DeForest, Wisconsin. The Company has not completed its initial accounting of this business combination as the valuation of the real and personal property has not been finalized. The following table summarizes the consideration paid for Sanimax Energy: March 15, 2016 Consideration at fair value for Sanimax: Cash $ 12,541 Common stock 4,050 Contingent consideration 4,500 Total $ 21,091 The fair value of the 500,000 shares of Common Stock issued was determined using the closing market price of the Company's common shares at the date of acquisition. REG Madison may pay contingent consideration of up to $5,000 (Earnout Payments) over a seven -year period after the acquisition, subject to achievement of certain milestones related to the biomass-based diesel gallons produced and sold by REG Madison. The Earnout Payments will be payable in cash and cannot exceed $1,700 in any one year period and $5,000 in aggregate. As of March 31, 2016, the Company has recorded a contingent liability of $4,500 , approximately $1,231 of which has been classified as current on the Condensed Consolidated Balance Sheets. The following table summarizes the estimated fair values of the assets acquired at the acquisition date. March 15, 2016 Assets acquired from Sanimax Energy: Inventory $ 1,591 Property, plant and equipment 19,500 Net identifiable assets acquired $ 21,091 The following pro forma condensed combined results of operations assume that the Sanimax Energy acquisition was completed as of January 1, 2015. Three Months Three Months Revenues $ 314,020 $ 237,242 Net income (loss) 1,701 (38,118 ) Basic net income (loss) per share $ 0.04 $ (0.85 )

Inventories

Inventories	3 Months Ended
	Mar. 31, 2016
Inventory Disclosure [Abstract]
Inventories	INVENTORIES Inventories consist of the following: March 31, 2016 December 31, 2015 Raw materials $ 40,497 $ 28,989 Work in process 4,027 3,014 Finished goods 89,257 53,887 Total $ 133,781 $ 85,890

Other Assets

Other Assets	3 Months Ended
	Mar. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	OTHER ASSETS Prepaid expense and other assets consist of the following: March 31, 2016 December 31, 2015 Commodity derivatives and related collateral, net $ 10,828 $ 10,097 Prepaid expenses 7,628 8,504 Deposits 3,925 3,824 RIN inventory 15,708 5,656 Taxes receivable 2,625 1,814 Other 2,559 1,987 Total $ 43,273 $ 31,882 RIN inventory values were adjusted in the amounts of $158 and $3,027 at March 31, 2016 and December 31, 2015 , respectively, to reflect the lower of cost or market. Other noncurrent assets consist of the following: March 31, 2016 December 31, 2015 Spare parts inventory $ 2,922 $ 2,922 Deposits 2,280 2,370 Other 6,470 6,527 Total $ 11,672 $ 11,819

Intangible Assets

Intangible Assets	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	INTANGIBLE ASSETS Intangible assets consist of the following: March 31, 2016 Cost Accumulated Amortization Net Weighted Average Remaining Life Raw material supply agreement $ 6,230 $ (1,653 ) $ 4,577 9.8 years Renewable hydrocarbon diesel technology 8,300 (1,014 ) 7,286 13.3 years Ground lease 200 (116 ) 84 5.6 years Acquired customer relationships 2,900 (179 ) 2,721 9.3 years Total amortizing intangibles 17,630 (2,962 ) 14,668 In-process research and development, indefinite lives 15,956 — 15,956 Total intangible assets $ 33,586 $ (2,962 ) $ 30,624 December 31, 2015 Cost Accumulated Amortization Net Weighted Average Remaining Life Raw material supply agreement $ 6,230 $ (1,551 ) $ 4,679 10.0 years Renewable hydrocarbon diesel technology 8,300 (876 ) 7,424 13.5 years Ground lease 200 (112 ) 88 5.9 years Acquired customer relationships 2,900 (106 ) 2,794 9.6 years Total amortizing intangibles 17,630 (2,645 ) 14,985 In-process research and development, indefinite lives 15,956 — 15,956 Total intangible assets $ 33,586 $ (2,645 ) $ 30,941 The Company recorded intangible amortization expense of $317 for the three months ended March 31, 2016 , and $237 for the three months ended March 31, 2015 . The estimated intangible asset amortization expense for the remainder of fiscal year 2016 through fiscal year 2022 and thereafter is as follows: April 1, 2016 through December 31, 2016 $ 972 2017 1,302 2018 1,309 2019 1,315 2020 1,322 2021 1,328 2022 and thereafter 7,120 Total $ 14,668

Debt

Debt	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Debt	DEBT The Company’s debt is as follows: March 31, 2016 December 31, 2015 2.75% Convertible Senior Notes, $143,750 face amount, due in June 2019 $ 127,255 $ 126,053 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 4%, due in December 2017 6,192 — REG Newton term loan, secured, variable interest rate of LIBOR plus 4%, due in December 2018 16,106 16,800 REG Mason City term loan, fixed interest rate of 5%, due in July 2019 3,445 3,675 REG Ames term loans, secured, fixed interest rates of 3.5% and 4.25%, due in January 2018 and December 2019, respectively 3,818 3,901 REG Grays Harbor term loan, variable interest of minimum of 3.5% or Prime Rate plus 0.25%, due in May 2022 5,225 5,225 Other 2,039 908 Total debt before debt issuance costs 264,080 256,562 Less: current portion of long-term debt 9,109 5,206 Less: Debt issuance costs (net of accumulated amortization of $2,515 and $2,296, respectively 3,817 4,105 Total long-term debt $ 251,154 $ 247,251 On October 31, 2015, REG Danville, LLC entered into an Second Amended and Restated Loan Agreement with Fifth Third Bank regarding the construction/term loan (the "Fifth Third Construction/Term Loan"). The renewed Fifth Third Construction/Term Loan increased the principal amount of the Construction/Term Loan to $12,000 and had a three year term with the maturity of the loan being extended to December 19, 2017. The loan requires monthly principal payments of $212 and interest to be charged using LIBOR plus 4% per annum. The loan agreement contains various loan covenants. As of March 31, 2016, there was $6,192 outstanding under the Fifth Third Construction/Term Loan. Lines of Credit March 31, 2016 December 31, 2015 Amount outstanding under lines of credit $ 2,864 $ 23,149 Maximum available to be borrowed under lines of credit $ 60,205 $ 23,067 On March 16, 2016, REG Energy Services, LLC ("REG Energy Services") entered into an operating and revolving line of credit agreement (the "Agreement") with Bankers Trust Company (“Bankers Trust”). Pursuant to the Agreement, Bankers Trust agreed to provide an operating and revolving line of credit (the "Line of Credit") to REG Energy Services in the amount of $30,000 . Amounts outstanding under the Agreement bear variable interest as stipulated in the Agreement. The Agreement contains various loan covenants that restrict REG Energy Services’ ability to take certain actions, including prohibiting it in certain circumstances from making payments to the Company. In addition, the Line of Credit is secured by substantially all of REG Energy Services’ accounts receivable and inventory.

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2016
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, as known as Landus Cooperative ("Landus") is no longer a related party as Landus no longer holds ten percent or more of the Company’s outstanding Common Stock nor a board seat on the Company board for the three months ended March 31, 2016. Transactions with Landus prior to the Company's determination that Landus was no longer a related party amounted to $4,542 for the three months ended March 31, 2015. This amount was included in the Costs of goods sold - Biomass-based diesel on the Condensed Consolidated Statements of Operations.

Derivative Instruments

Derivative Instruments	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 , the net notional volumes of heating oil and soybean oil covered under the open commodity derivative contracts were approximately 98 million gallons and 40 million pounds, respectively. 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: March 31, 2016 December 31, 2015 Assets Liabilities Assets Liabilities Gross amounts of derivatives recognized at fair value $ 2,408 $ 6,921 $ 4,644 $ 185 Cash collateral 15,341 — 5,638 — Total gross amount recognized 17,749 6,921 10,282 185 Gross amounts offset (6,921 ) (6,921 ) (185 ) (185 ) Net amount reported in the condensed consolidated balance sheet $ 10,828 $ — $ 10,097 $ — The following table sets forth the commodity contract derivatives losses included in the Condensed Consolidated Statements of Operations: Location of Gain (Loss) Three Months Three Months Commodity derivatives Cost of goods sold – Biomass-based diesel $ (4,269 ) $ (623 )

Fair Value Measurement

Fair Value Measurement	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 Total Level 1 Level 2 Level 3 Commodity contract derivatives $ (4,513 ) $ (3,350 ) $ (1,163 ) $ — Contingent considerations for acquisitions (45,616 ) — — (45,616 ) $ (50,129 ) $ (3,350 ) $ (1,163 ) $ (45,616 ) As of December 31, 2015 Total Level 1 Level 2 Level 3 Commodity contract derivatives $ 4,459 $ 2,196 $ 2,263 $ — Contingent considerations for acquisitions (41,712 ) — — (41,712 ) $ (37,253 ) $ 2,196 $ 2,263 $ (41,712 ) 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 Acquisitions March 31, 2016 March 31, 2015 Balance at beginning of period $ 41,712 $ 39,319 Fair value of contingent consideration at measurement date 4,500 — Change in estimates included in earnings (15 ) 293 Settlements (581 ) (1,052 ) Balance at end of period $ 45,616 $ 38,560 The estimated fair values of the Company’s financial instruments, which are not recorded at fair value, are as follows: As of March 31, 2016 As of December 31, 2015 Asset (Liability) Fair Value Asset (Liability) Fair Value Financial liabilities: Debt and lines of credit $ (263,127 ) $ (262,664 ) $ (279,711 ) $ (275,123 ) 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: 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 contingent consideration regarding REG Life Sciences, LLC ("REG Life Sciences") 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 REG Life Sciences' 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 all other 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 production and/or sale of biomass-based diesel at the specific production facility. A discount rate ranging from 5.8% to 10.0% 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	3 Months Ended
	Mar. 31, 2016
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 Options to purchase common stock 87,026 87,026 Stock appreciation rights 2,350,368 2,123,770 Convertible notes 10,838,218 10,838,218 Total 13,275,612 13,049,014 The following table presents the calculation of diluted net loss per share: Three Months Three Months Net income (loss) attributable to the Company’s common stockholders - Basic $ 1,632 $ (38,107 ) Less: effect of participating securities — — Net income (loss) attributable to common stockholders - Dilutive $ 1,632 $ (38,107 ) Shares: Weighted-average shares used to compute basic net income (loss) per share 43,899,084 44,362,637 Adjustment to reflect warrants to purchase common stock — — Adjustment to reflect stock appreciation right conversions — — Weighted-average shares used to compute diluted net income (loss) per share 43,899,084 44,362,637 Net income (loss) per share attributable to common stockholders: Diluted $ 0.04 $ (0.86 )

Reportable Segments and Geograp

Reportable Segments and Geographic Information	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Reportable Segments and Geographic Information	REPORTABLE SEGMENTS AND GEOGRAPHIC INFORMATION The Company reports its reportable segments based on products and services provided to customers. The Company re-assesses its reportable segment on an annual basis. During the fourth quarter of 2015, due to the increasing activities surrounding its renewable chemicals business, the Company changed the composition of its operating segments from two reportable segments to three reportable segments by presenting Renewable Chemicals separate from Biomass-based Diesel. The new reportable segments generally align the Company's external financial reporting segments with its new internal operating segments, which are based on its internal organizational structure, operating decisions, and performance assessment. As such, the Company's reportable segments at March 31, 2016 and December 31, 2015 include Biomass-based Diesel, Services, Renewable Chemicals and Corporate and other activities. The accounting policies of the segments are the same as those described in the summary of significant accounting policies. All prior period disclosures below have been recast to present results on a comparable basis. 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. Revenue is derived from the purchases and sales of biomass-based diesel, RINs 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, related by-products and renewable energy government incentive payments, in the U.S. and internationally. The Services segment offers services for managing the construction of biomass-based diesel production facilities and managing ongoing operations of 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. Revenues are recorded by the Services segment at cost. The Renewable Chemicals segment consists of research and development activities involving the production of renewable chemicals, additional advanced biofuels and other products from the Company's proprietary microbial fermentation process and the operations of a demonstration scale facility located in Okeechobee, Florida. No revenues were recorded by the Renewable Chemicals segment during the three months ended March 31, 2016 and 2015. The Corporate and Other segment includes trading activities related to petroleum-based heating oil and diesel fuel as well as corporate activities, which consist of corporate office expenses such as compensation, benefits, occupancy and other administrative costs, including management service expenses. Corporate and other also includes income/(expense) not associated with the reportable segments, such as corporate general and administrative expenses, shared service expenses, interest expense and interest income, all reflected on an accrual basis of accounting. In addition, corporate and other includes cash and other assets not associated with the reportable segments, including investments. Intersegment revenues are reported by the Services and Corporate and Other segments. The following table represents the significant items by reportable segment: Three Months Three Months Net revenues: Biomass-based Diesel (includes Petrotec's net sales of $36,995 and $29,993, respectively) $ 292,762 $ 224,188 Services 20,737 15,471 Corporate and Other 16,988 7,342 Intersegment revenues (24,893 ) (16,083 ) $ 305,594 $ 230,918 Income (loss) before income taxes: Biomass-based Diesel (includes Petrotec's income (loss) of $407 and ($1,048), respectively) $ 12,860 $ (31,676 ) Services 573 50 Renewable Chemicals (4,681 ) (3,891 ) Corporate and other (7,188 ) (3,684 ) $ 1,564 $ (39,201 ) Depreciation and amortization expense, net: Biomass-based Diesel (includes Petrotec's amounts of $851 and $687, respectively) $ 6,929 $ 4,971 Services 96 62 Renewable Chemicals 414 343 Corporate and other 396 350 $ 7,835 $ 5,726 Cash paid for purchases of property, plant and equipment: Biomass-based Diesel (includes Petrotec's amounts of $347 and $318, respectively) $ 13,604 $ 10,410 Services 1,166 722 Renewable Chemicals — 140 Corporate and other — 906 $ 14,770 $ 12,178 As of As of Goodwill: Services $ 16,080 $ 16,080 Assets: Biomass-based Diesel (including Petrotec's assets of $52,221 and $45,471, respectively) $ 1,003,250 $ 1,048,923 Services 49,636 60,308 Renewable Chemicals 24,150 23,872 Corporate and other 366,739 308,782 Intersegment eliminations $ (219,418 ) $ (218,265 ) $ 1,224,357 $ 1,223,620 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. As of Three Months As of Three Months Net revenues: United States $ 268,599 $ 200,925 Foreign 36,995 29,993 $ 305,594 $ 230,918 As of As of, March 31, 2016 As of As of, December 31, 2015 Long-lived assets: United States $ 579,544 $ 553,987 Foreign 20,986 20,597 $ 600,530 $ 574,584

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2016
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.

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
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 March 31, 2016 , over $231,000 of the receivable amounts outstanding at December 31, 2015 related to the 2015 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 with a net book value of approximately $11,027 were impaired as a result of the fire. As of the date of this report, the Company has received property insurance proceeds of $14,570 , of which $11,027 was related to the property damage. The excess of the property insurance proceeds over the net book value of the impaired assets, $3,543 , was recorded as gain on involuntary conversion on the Condensed Consolidated Statements of Operations during the three months ended March 31, 2016. In September 2015, another fire occurred at the Geismar facility. The Company estimated fixed assets with a net book value of approximately $1,414 were impaired by the September fire. The Company believes it is probable that it will recover all the net book value of the assets damaged by the fire under its insurance policies. As such, a receivable was recorded as an offset to the estimated impairment loss. No impact on earnings was recognized.
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. At March 31, 2016 and December 31, 2015, the Company had goodwill in only one of its reporting units: Services. The annual impairment test at July 31, 2015 determined that the fair value of the Services reporting unit exceeded its carrying value by approximately 21% . The interim goodwill impairment test as of October 31, 2015 determined that the fair value of the Services reporting unit exceeded its carrying value by 24% . There have been no impairment indicators in the first three months of 2016 that would 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. The program is in effect through October 31, 2016. 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 three months ended March 31, 2016 , the Company repurchased shares of Common Stock in the amount of $5,817 , of which $944 was paid after March 31, 2016 under this share repurchase program. In March 2016, the Company's board of directors approved a repurchase program of up to $50,000 of the Company's shares of common stock and/or convertible notes, in effect through March 5, 2018. Under the program, which is in addition to the $30,000 common stock repurchase program announced in February 2015, the Company may repurchase shares or bonds from time to time in open market transactions, privately negotiated transactions or by other means. The timing and amount of repurchase transactions will be determined by the Company's management based on its evaluation of market conditions, share price, bond price, legal requirements and other factors. No shares or convertible notes were repurchased under this program during the three months ended March 31, 2016.
New Accounting Standards	New Accounting Standards In March 2016, the FASB issued ASU 2016-08, "Revenue from Contracts with Customers (Topic 606): Principal versus Agent Consideration (Reporting Revenue Gross versus Net)" that clarifies how an entity should identify the unit of accounting for the principal versus agent evaluation and how it should apply the control principle to certain types of arrangements, such as service transactions. The guidance also re-frames the indicators to focus on evidence that an entity is acting as a principal rather than an agent. The guidance is effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company is evaluating the impact this guidance will have on its consolidated financial statements. In March 2016, the FASB issued ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting”. The amendments in this updated guidance include changes to simplify the codification for several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. For public entities, this guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within that reporting period. Early adoption is permitted. The Company is evaluating the impact this new guidance will have on its consolidated financial statements.

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2016
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Information	The following pro forma condensed combined results of operations assume that the Sanimax Energy acquisition was completed as of January 1, 2015. Three Months Three Months Revenues $ 314,020 $ 237,242 Net income (loss) 1,701 (38,118 ) Basic net income (loss) per share $ 0.04 $ (0.85 )
Sanimax Energy, LLC
Business Acquisition [Line Items]
Schedule of Business Acquisitions	The following table summarizes the consideration paid for Sanimax Energy: March 15, 2016 Consideration at fair value for Sanimax: Cash $ 12,541 Common stock 4,050 Contingent consideration 4,500 Total $ 21,091 The following table summarizes the estimated fair values of the assets acquired at the acquisition date. March 15, 2016 Assets acquired from Sanimax Energy: Inventory $ 1,591 Property, plant and equipment 19,500 Net identifiable assets acquired $ 21,091

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2016
Inventory Disclosure [Abstract]
Inventories	Inventories consist of the following: March 31, 2016 December 31, 2015 Raw materials $ 40,497 $ 28,989 Work in process 4,027 3,014 Finished goods 89,257 53,887 Total $ 133,781 $ 85,890

Other Assets (Tables)

Other Assets (Tables)	3 Months Ended
	Mar. 31, 2016
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: March 31, 2016 December 31, 2015 Commodity derivatives and related collateral, net $ 10,828 $ 10,097 Prepaid expenses 7,628 8,504 Deposits 3,925 3,824 RIN inventory 15,708 5,656 Taxes receivable 2,625 1,814 Other 2,559 1,987 Total $ 43,273 $ 31,882
Summary of other noncurrent assets	Other noncurrent assets consist of the following: March 31, 2016 December 31, 2015 Spare parts inventory $ 2,922 $ 2,922 Deposits 2,280 2,370 Other 6,470 6,527 Total $ 11,672 $ 11,819

Intangible Assets (Tables)

Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Components of Intangible assets	Intangible assets consist of the following: March 31, 2016 Cost Accumulated Amortization Net Weighted Average Remaining Life Raw material supply agreement $ 6,230 $ (1,653 ) $ 4,577 9.8 years Renewable hydrocarbon diesel technology 8,300 (1,014 ) 7,286 13.3 years Ground lease 200 (116 ) 84 5.6 years Acquired customer relationships 2,900 (179 ) 2,721 9.3 years Total amortizing intangibles 17,630 (2,962 ) 14,668 In-process research and development, indefinite lives 15,956 — 15,956 Total intangible assets $ 33,586 $ (2,962 ) $ 30,624 December 31, 2015 Cost Accumulated Amortization Net Weighted Average Remaining Life Raw material supply agreement $ 6,230 $ (1,551 ) $ 4,679 10.0 years Renewable hydrocarbon diesel technology 8,300 (876 ) 7,424 13.5 years Ground lease 200 (112 ) 88 5.9 years Acquired customer relationships 2,900 (106 ) 2,794 9.6 years Total amortizing intangibles 17,630 (2,645 ) 14,985 In-process research and development, indefinite lives 15,956 — 15,956 Total intangible assets $ 33,586 $ (2,645 ) $ 30,941
Estimated amortization expense	The estimated intangible asset amortization expense for the remainder of fiscal year 2016 through fiscal year 2022 and thereafter is as follows: April 1, 2016 through December 31, 2016 $ 972 2017 1,302 2018 1,309 2019 1,315 2020 1,322 2021 1,328 2022 and thereafter 7,120 Total $ 14,668

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Company's Borrowings	The Company’s debt is as follows: March 31, 2016 December 31, 2015 2.75% Convertible Senior Notes, $143,750 face amount, due in June 2019 $ 127,255 $ 126,053 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 4%, due in December 2017 6,192 — REG Newton term loan, secured, variable interest rate of LIBOR plus 4%, due in December 2018 16,106 16,800 REG Mason City term loan, fixed interest rate of 5%, due in July 2019 3,445 3,675 REG Ames term loans, secured, fixed interest rates of 3.5% and 4.25%, due in January 2018 and December 2019, respectively 3,818 3,901 REG Grays Harbor term loan, variable interest of minimum of 3.5% or Prime Rate plus 0.25%, due in May 2022 5,225 5,225 Other 2,039 908 Total debt before debt issuance costs 264,080 256,562 Less: current portion of long-term debt 9,109 5,206 Less: Debt issuance costs (net of accumulated amortization of $2,515 and $2,296, respectively 3,817 4,105 Total long-term debt $ 251,154 $ 247,251
Revolving Line of Credit	Lines of Credit March 31, 2016 December 31, 2015 Amount outstanding under lines of credit $ 2,864 $ 23,149 Maximum available to be borrowed under lines of credit $ 60,205 $ 23,067

Derivative Instruments (Tables)

Derivative Instruments (Tables)	3 Months Ended
	Mar. 31, 2016
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: March 31, 2016 December 31, 2015 Assets Liabilities Assets Liabilities Gross amounts of derivatives recognized at fair value $ 2,408 $ 6,921 $ 4,644 $ 185 Cash collateral 15,341 — 5,638 — Total gross amount recognized 17,749 6,921 10,282 185 Gross amounts offset (6,921 ) (6,921 ) (185 ) (185 ) Net amount reported in the condensed consolidated balance sheet $ 10,828 $ — $ 10,097 $ —
Summary of Derivative Financial Instruments by Location of Gain (Loss)	The following table sets forth the commodity contract derivatives losses included in the Condensed Consolidated Statements of Operations: Location of Gain (Loss) Three Months Three Months Commodity derivatives Cost of goods sold – Biomass-based diesel $ (4,269 ) $ (623 )

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Assets (Liabilities) Measured at Fair Value	A summary of assets (liabilities) measured at fair value is as follows: As of March 31, 2016 Total Level 1 Level 2 Level 3 Commodity contract derivatives $ (4,513 ) $ (3,350 ) $ (1,163 ) $ — Contingent considerations for acquisitions (45,616 ) — — (45,616 ) $ (50,129 ) $ (3,350 ) $ (1,163 ) $ (45,616 ) As of December 31, 2015 Total Level 1 Level 2 Level 3 Commodity contract derivatives $ 4,459 $ 2,196 $ 2,263 $ — Contingent considerations for acquisitions (41,712 ) — — (41,712 ) $ (37,253 ) $ 2,196 $ 2,263 $ (41,712 )
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 Acquisitions March 31, 2016 March 31, 2015 Balance at beginning of period $ 41,712 $ 39,319 Fair value of contingent consideration at measurement date 4,500 — Change in estimates included in earnings (15 ) 293 Settlements (581 ) (1,052 ) Balance at end of period $ 45,616 $ 38,560
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 March 31, 2016 As of December 31, 2015 Asset (Liability) Fair Value Asset (Liability) Fair Value Financial liabilities: Debt and lines of credit $ (263,127 ) $ (262,664 ) $ (279,711 ) $ (275,123 )

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	3 Months Ended
	Mar. 31, 2016
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 Options to purchase common stock 87,026 87,026 Stock appreciation rights 2,350,368 2,123,770 Convertible notes 10,838,218 10,838,218 Total 13,275,612 13,049,014
Calculation of diluted net income per share	The following table presents the calculation of diluted net loss per share: Three Months Three Months Net income (loss) attributable to the Company’s common stockholders - Basic $ 1,632 $ (38,107 ) Less: effect of participating securities — — Net income (loss) attributable to common stockholders - Dilutive $ 1,632 $ (38,107 ) Shares: Weighted-average shares used to compute basic net income (loss) per share 43,899,084 44,362,637 Adjustment to reflect warrants to purchase common stock — — Adjustment to reflect stock appreciation right conversions — — Weighted-average shares used to compute diluted net income (loss) per share 43,899,084 44,362,637 Net income (loss) per share attributable to common stockholders: Diluted $ 0.04 $ (0.86 )

Reportable Segments and Geogr31

Reportable Segments and Geographic Information (Tables)	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Segment for the Results of Operations	The following table represents the significant items by reportable segment: Three Months Three Months Net revenues: Biomass-based Diesel (includes Petrotec's net sales of $36,995 and $29,993, respectively) $ 292,762 $ 224,188 Services 20,737 15,471 Corporate and Other 16,988 7,342 Intersegment revenues (24,893 ) (16,083 ) $ 305,594 $ 230,918 Income (loss) before income taxes: Biomass-based Diesel (includes Petrotec's income (loss) of $407 and ($1,048), respectively) $ 12,860 $ (31,676 ) Services 573 50 Renewable Chemicals (4,681 ) (3,891 ) Corporate and other (7,188 ) (3,684 ) $ 1,564 $ (39,201 ) Depreciation and amortization expense, net: Biomass-based Diesel (includes Petrotec's amounts of $851 and $687, respectively) $ 6,929 $ 4,971 Services 96 62 Renewable Chemicals 414 343 Corporate and other 396 350 $ 7,835 $ 5,726 Cash paid for purchases of property, plant and equipment: Biomass-based Diesel (includes Petrotec's amounts of $347 and $318, respectively) $ 13,604 $ 10,410 Services 1,166 722 Renewable Chemicals — 140 Corporate and other — 906 $ 14,770 $ 12,178 As of As of Goodwill: Services $ 16,080 $ 16,080 Assets: Biomass-based Diesel (including Petrotec's assets of $52,221 and $45,471, respectively) $ 1,003,250 $ 1,048,923 Services 49,636 60,308 Renewable Chemicals 24,150 23,872 Corporate and other 366,739 308,782 Intersegment eliminations $ (219,418 ) $ (218,265 ) $ 1,224,357 $ 1,223,620
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas	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. As of Three Months As of Three Months Net revenues: United States $ 268,599 $ 200,925 Foreign 36,995 29,993 $ 305,594 $ 230,918 As of As of, March 31, 2016 As of As of, December 31, 2015 Long-lived assets: United States $ 579,544 $ 553,987 Foreign 20,986 20,597 $ 600,530 $ 574,584

Basis of Presentation and Nat32

Basis of Presentation and Nature of the Business (Details) gal in Millions	3 Months Ended
	Mar. 31, 2016facilitybiorefinerygal	Mar. 15, 2016gal
Class of Stock [Line Items]
Number of operating biodiesel production facilities | facility	11
Production capacity per year | gal	452
Sanimax Energy, LLC
Class of Stock [Line Items]
Production capacity per year | gal	20	20
Petrotec AG
Class of Stock [Line Items]
Number of biorefineries | biorefinery	2
North America
Class of Stock [Line Items]
Number of biorefineries | biorefinery	12

Summary of Significant Accoun33

Summary of Significant Accounting Policies (Details) - USD ($)	Oct. 31, 2015	Jul. 31, 2015	Sep. 30, 2015	Apr. 30, 2015	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Dec. 31, 2015	Feb. 28, 2015
Business Acquisition [Line Items]
Accounts receivable, net					$ 106,350,000		$ 106,350,000	$ 310,731,000
Estimated impaired fixed assets			$ 1,414,000	$ 11,027,000
Insurance recoveries							14,570,000
Gain on involuntary conversion					3,543,000	$ 0
February 2,015
Business Acquisition [Line Items]
Share repurchase program, amount authorized to be repurchased									$ 30,000,000
Share repurchased program, amount repurchased					5,817,000
Share repurchased program, amount repurchased and paid in subsequent period					944,000
March 2,016
Business Acquisition [Line Items]
Share repurchase program, amount authorized to be repurchased					50,000,000		50,000,000
Share repurchased program, amount repurchased					0
Services
Business Acquisition [Line Items]
Minimum percentage of increase in fair value of goodwill over carrying value	24.00%	21.00%
Biodiesel Mixture Excise Tax Credit
Business Acquisition [Line Items]
Accounts receivable, net					$ 231,000,000		$ 231,000,000

Acquisitions (Details Textual)

Acquisitions (Details Textual) $ in Thousands, gal in Millions	Mar. 15, 2016USD ($)sharesgal	Mar. 31, 2016USD ($)gal	Dec. 31, 2015USD ($)
Business Acquisition [Line Items]
Production capacity per year | gal		452
Contingent consideration for acquisitions		$ 28,890	$ 26,949
Sanimax Energy, LLC
Business Acquisition [Line Items]
Production capacity per year | gal	20	20
Shares of common stock issued | shares	500,000
Contingent consideration for acquisitions	$ 5,000	$ 4,500
Earnout payment period	7 years
Maximum Earnout Payment per year	$ 1,700
Current contingent liability		$ 1,231

Acquisitions (Details)

Acquisitions (Details) - Sanimax Energy, LLC $ in Thousands	Mar. 15, 2016USD ($)
Business Acquisition [Line Items]
Cash	$ 12,541
Common stock	4,050
Contingent consideration	4,500
Total	21,091
Assets acquired from Sanimax Energy:
Inventory	1,591
Property, plant and equipment	19,500
Net identifiable assets acquired	$ 21,091

Acquisitions (Pro Forma) (Detai

Acquisitions (Pro Forma) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Business Combinations [Abstract]
Revenues	$ 314,020	$ 237,242
Net income (loss)	$ 1,701	$ (38,118)
Basic net income (loss) per share (in dollars per share)	$ 0.04	$ (0.85)

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Inventories
Raw materials	$ 40,497	$ 28,989
Work in process	4,027	3,014
Finished goods	89,257	53,887
Total	$ 133,781	$ 85,890

Other Assets (Details)

Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Summary of prepaid expense and other assets
Commodity derivatives and related collateral, net	$ 10,828	$ 10,097
Prepaid expenses	7,628	8,504
Deposits	3,925	3,824
RIN inventory	15,708	5,656
Taxes receivable	2,625	1,814
Other	2,559	1,987
Total	$ 43,273	$ 31,882

Other Assets (Details Textual)

Other Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Other Assets [Abstract]
Inventory reduced to lower of cost or market	$ 158	$ 3,027

Other Assets (Details 1)

Other Assets (Details 1) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Spare parts inventory	$ 2,922	$ 2,922
Deposits	2,280	2,370
Other	6,470	6,527
Total	$ 11,672	$ 11,819

Intangible Assets (Details)

Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	$ 17,630	$ 17,630
Accumulated Amortization, finite-lived	(2,962)	(2,645)
Total	14,668	14,985
Cost, indefinite lived	33,586	33,586
Accumulated Amortization, indefinite-lived	(2,962)	(2,645)
Net, indefinite-lived	30,624	30,941
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	6,230	6,230
Accumulated Amortization, finite-lived	(1,653)	(1,551)
Total	$ 4,577	$ 4,679
Weighted Average Remaining Life	9 years 9 months	10 years
Renewable hydrocarbon diesel technology
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	$ 8,300	$ 8,300
Accumulated Amortization, finite-lived	(1,014)	(876)
Total	$ 7,286	$ 7,424
Weighted Average Remaining Life	13 years 3 months	13 years 6 months
Ground lease
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	$ 200	$ 200
Accumulated Amortization, finite-lived	(116)	(112)
Total	$ 84	$ 88
Weighted Average Remaining Life	5 years 6 months 24 days	5 years 10 months 24 days
Acquired customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	$ 2,900	$ 2,900
Accumulated Amortization, finite-lived	(179)	(106)
Total	$ 2,721	$ 2,794
Weighted Average Remaining Life	9 years 4 months	9 years 7 months

Intangible Assets (Details Text

Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible amortization expense	$ 317	$ 237

Intangible Assets (Details 1)

Intangible Assets (Details 1) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Estimated amortization expense
April 1, 2016 through December 31, 2016	$ 972
2,017	1,302
2,018	1,309
2,019	1,315
2,020	1,322
2,021	1,328
2022 and thereafter	7,120
Total	$ 14,668	$ 14,985

Debt (Details)

Debt (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Accumulated amortization on debt issuance costs	$ 2,515,000	$ 2,296,000
Company's borrowings
Total notes payable	264,080,000	256,562,000
Less: current portion of long-term debt	9,109,000	5,206,000
Less: Debt issuance costs (net of accumulated amortization of $2,515 and $2,296, respectively	3,817,000	4,105,000
Total long-term debt	$ 251,154,000	$ 247,251,000
Convertible Senior Notes
Line of Credit Facility [Line Items]
Interest rate	2.75%	2.75%
Face amount	$ 143,750,000	$ 143,750,000
Company's borrowings
Total notes payable	127,255,000	126,053,000
REG Geismar GOZone bonds
Company's borrowings
Total notes payable	100,000,000	$ 100,000,000
REG Danville term loan
Line of Credit Facility [Line Items]
Face amount	$ 12,000,000
Description of variable rate basis	LIBOR plus 4% per annum	LIBOR plus 4% per annum
Company's borrowings
Total notes payable	$ 6,192,000	$ 0
REG Danville term loan | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate	4.00%	4.00%
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	$ 16,106,000	$ 16,800,000
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	$ 3,445,000	$ 3,675,000
REG Ames term loans
Company's borrowings
Total notes payable	$ 3,818,000	$ 3,901,000
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%
REG Grays Harbor term loan
Line of Credit Facility [Line Items]
Description of variable rate basis	Prime Rate plus 0.25%	Prime Rate plus 0.25%
Basis spread on variable rate	3.50%	3.50%
Company's borrowings
Total notes payable	$ 5,225,000	$ 5,225,000
REG Grays Harbor term loan | Prime Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.25%	0.25%
Other
Company's borrowings
Total notes payable	$ 2,039,000	$ 908,000

Debt (Details Textual)

Debt (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Notes payable	$ 264,080,000	$ 256,562,000
REG Danville term loan
Debt Instrument [Line Items]
Face amount	$ 12,000,000
Debt instrument term	3 years
Monthly principal payment	$ 212,000
Notes payable	$ 6,192,000	$ 0
REG Danville term loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	4.00%	4.00%
Bankers Trust Company
Debt Instrument [Line Items]
Line of credit	$ 30,000,000

Debt (Details 1)

Debt (Details 1) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Amount outstanding under lines of credit	$ 2,864	$ 23,149
Maximum available to be borrowed under lines of credit	$ 60,205	$ 23,067

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Related Party Transactions [Abstract]
Biomass-based diesel—related parties	$ 0	$ 4,542

Derivative Instruments (Details

Derivative Instruments (Details Textual) lb in Millions, gal in Millions	3 Months Ended
	Mar. 31, 2016lbgal
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Heating oil covered under the open commodity derivative contracts (in gallons) | gal	98
Soybean oil covered under the open commodity derivative contracts (in pounds) | lb	40

Derivative Instruments (Detai49

Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets
Gross amounts of derivatives recognized at fair value	$ 2,408	$ 4,644
Cash collateral	15,341	5,638
Total gross amount recognized	17,749	10,282
Gross amounts offset	(6,921)	(185)
Net amount reported in the condensed consolidated balance sheet	10,828	10,097
Liabilities
Gross amounts of derivatives recognized at fair value	6,921	185
Cash collateral	0	0
Total gross amount recognized	6,921	185
Gross amounts offset	(6,921)	(185)
Net amount reported in the condensed consolidated balance sheet	$ 0	$ 0

Derivative Instruments (Detai50

Derivative Instruments (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cost of goods sold – Biomass-based diesel | Commodity derivatives
Derivative Instruments Gain Loss [Line Items]
Pre-tax gains (losses) included in the condensed consolidated statement of operations	$ (4,269)	$ (623)

Fair Value Measurement (Details

Fair Value Measurement (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	$ (50,129)	$ (37,253)
Level 1
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(3,350)	2,196
Level 2
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(1,163)	2,263
Level 3
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(45,616)	(41,712)
Commodity contract derivatives
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(4,513)	4,459
Commodity contract derivatives | Level 1
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(3,350)	2,196
Commodity contract derivatives | Level 2
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(1,163)	2,263
Commodity contract derivatives | Level 3
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	0	0
Contingent consideration for acquisition
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(45,616)	(41,712)
Contingent consideration for acquisition | Level 1
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	0	0
Contingent consideration for acquisition | Level 2
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	0	0
Contingent consideration for acquisition | Level 3
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	$ (45,616)	$ (41,712)

Fair Value Measurement (Detai52

Fair Value Measurement (Details 1) - Contingent Consideration for Acquisition - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 41,712	$ 39,319
Fair value of contingent consideration at measurement date	4,500	0
Change in estimates included in earnings	(15)	293
Settlements	(581)	(1,052)
Ending balance	$ 45,616	$ 38,560

Fair Value Measurement (Detai53

Fair Value Measurement (Details 2) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Asset (Liability) Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt and lines of credit	$ (263,127)	$ (279,711)
Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt and lines of credit	$ (262,664)	$ (275,123)

Fair Value Measurement (Detai54

Fair Value Measurement (Details Textual)	3 Months Ended
	Mar. 31, 2016
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value inputs, discount rate	5.80%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value inputs, discount rate	10.00%
REG Life Sciences
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value inputs, discount rate	8.00%

Net Income (Loss) Per Share (De

Net Income (Loss) Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	13,275,612	13,049,014
Stock appreciation rights
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	2,350,368	2,123,770
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	87,026	87,026
Convertible notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	10,838,218	10,838,218

Net Income (Loss) Per Share (56

Net Income (Loss) Per Share (Details 1) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY’S COMMON STOCKHOLDERS	$ 1,632	$ (38,107)
Less: effect of participating securities	0	0
Net income (loss) attributable to common stockholders - Dilutive	$ 1,632	$ (38,107)
Earnings Per Share, Basic, Other Disclosures [Abstract]
Weighted-average shares used to compute basic net income (loss) per share (in shares)	43,899,084	44,362,637
Adjustment to reflect warrants to purchase common stock (in shares)	0	0
Adjustment to reflect stock appreciation right conversions (in shares)	0	0
Weighted-average shares used to compute diluted net income (loss) per share (in shares)	43,899,084	44,362,637
Income (Loss) from Operations before Extraordinary Items, Per Diluted Share [Abstract]
Diluted (in usd per share)	$ 0.04	$ (0.86)

Reportable Segments and Geogr57

Reportable Segments and Geographic Information (Details Textual) - segment	3 Months Ended
	Dec. 31, 2015	Sep. 30, 2015
Segment Reporting [Abstract]
Number of Reportable Segments	3	2

Reportable Segments and Geogr58

Reportable Segments and Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net revenues:	$ 305,594	$ 230,918
Income (loss) before income taxes:	1,564	(39,201)
Depreciation and amortization expense, net:	7,835	5,726
Cash paid for purchases of property, plant and equipment:	14,770	12,178
Goodwill:	16,080		$ 16,080
Assets:	1,224,357		1,223,620
Corporate and Other
Segment Reporting Information [Line Items]
Net revenues:	16,988	7,342
Income (loss) before income taxes:	(7,188)	(3,684)
Depreciation and amortization expense, net:	396	350
Cash paid for purchases of property, plant and equipment:	0	906
Assets:	366,739		308,782
Intersegment revenues
Segment Reporting Information [Line Items]
Net revenues:	(24,893)	(16,083)
Assets:	(219,418)		(218,265)
Biomass-based Diesel | Segments
Segment Reporting Information [Line Items]
Net revenues:	292,762	224,188
Income (loss) before income taxes:	12,860	(31,676)
Depreciation and amortization expense, net:	6,929	4,971
Cash paid for purchases of property, plant and equipment:	13,604	10,410
Assets:	1,003,250		1,048,923
Biomass-based Diesel | Segments | Petrotec
Segment Reporting Information [Line Items]
Net revenues:	36,995	29,993
Income (loss) before income taxes:	407	(1,048)
Depreciation and amortization expense, net:	851	687
Cash paid for purchases of property, plant and equipment:	347	318
Assets:	52,221		45,471
Services
Segment Reporting Information [Line Items]
Goodwill:	16,080		16,080
Services | Segments
Segment Reporting Information [Line Items]
Net revenues:	20,737	15,471
Income (loss) before income taxes:	573	50
Depreciation and amortization expense, net:	96	62
Cash paid for purchases of property, plant and equipment:	1,166	722
Assets:	49,636		60,308
Renewable Chemicals | Segments
Segment Reporting Information [Line Items]
Income (loss) before income taxes:	(4,681)	(3,891)
Depreciation and amortization expense, net:	414	343
Cash paid for purchases of property, plant and equipment:	0	$ 140
Assets:	$ 24,150		$ 23,872

Reportable Segments and Geogr59

Reportable Segments and Geographic Information (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues:	$ 305,594	$ 230,918
Long-lived assets:	600,530		$ 574,584
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues:	268,599	200,925
Long-lived assets:	579,544		553,987
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues:	36,995	$ 29,993
Long-lived assets:	$ 20,986		$ 20,597