Renewable Energy (REGI) 10-Q 8 Aug 16 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Jul. 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	Jun. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		38,679,201

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 74,078	$ 47,081
Accounts receivable, net	97,493	310,731
Inventories	129,849	85,890
Prepaid expenses and other assets	73,069	31,882
Total current assets	374,489	475,584
Property, plant and equipment, net	602,409	574,584
Goodwill	16,080	16,080
Intangible assets, net	30,301	30,941
Investments	12,181	8,797
Other assets	12,215	11,819
Restricted cash	105,815	105,815
TOTAL ASSETS	1,153,490	1,223,620
CURRENT LIABILITIES:
Lines of credit	48,603	23,149
Current maturities of long-term debt	7,959	5,206
Accounts payable	83,343	236,817
Accrued expenses and other liabilities	25,978	28,466
Deferred revenue	2,090	333
Total current liabilities	167,973	293,971
Unfavorable lease obligation	16,429	17,343
Deferred income taxes	18,779	19,186
Contingent consideration for acquisitions	34,366	26,949
Convertible debt conversion liability	26,713	0
Long-term debt (net of debt issuance costs of $6,748 and $4,105, respectively)	306,207	247,251
Other liabilities	4,724	4,910
Total liabilities	575,191	609,610
COMMITMENTS AND CONTINGENCIES
EQUITY:
Common stock ($.0001 par value; 300,000,000 shares authorized; 39,179,201 and 43,837,714 shares outstanding, respectively)	5	4
Common stock—additional paid-in-capital	477,169	474,367
Retained earnings	178,352	169,680
Accumulated other comprehensive loss	(3,598)	(4,009)
Treasury stock (8,617,567 and 3,178,372 shares outstanding, respectively)	(76,219)	(28,762)
Total equity attributable to the Company's shareholders	575,709	611,280
Non-controlling interest	2,590	2,730
Total equity	578,299	614,010
TOTAL LIABILITIES AND EQUITY	$ 1,153,490	$ 1,223,620

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Debt issuance costs	$ 6,748	$ 4,105
Common stock, par or stated value per share (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares, outstanding (in shares)	39,179,201	43,837,714
Treasury stock, shares outstanding (in shares)	8,617,567	3,178,372

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
REVENUES:
Biomass-based diesel sales	$ 460,115	$ 366,455	$ 707,279	$ 587,481
Biomass-based diesel government incentives	97,153	7,278	155,554	17,066
Total biomass-based diesel revenue	557,268	373,733	862,833	604,547
Other revenue	1,033	29	1,062	133
Total revenues	558,301	373,762	863,895	604,680
COSTS OF GOODS SOLD:
Biomass-based diesel	533,439	357,832	813,925	600,342
Biomass-based diesel—related parties	0	0	0	4,542
Other costs of goods sold	0	23	2	84
Total cost of goods sold	533,439	357,855	813,927	604,968
GROSS PROFIT (LOSS)	24,862	15,907	49,968	(288)
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	20,850	15,359	40,626	32,034
RESEARCH AND DEVELOPMENT EXPENSE	4,427	4,390	8,353	8,250
GAIN ON INVOLUNTARY CONVERSION	(997)	0	(4,540)	0
INCOME (LOSS) FROM OPERATIONS	582	(3,842)	5,529	(40,572)
OTHER INCOME (EXPENSE), NET:
Change in fair value of contingent consideration	(3,571)	2,121	(3,556)	1,828
Change in fair value of convertible debt conversion liability	13,432	0	13,432	0
Gain on debt extinguishment	2,152	0	2,152	0
Other income (loss), net	154	1,779	67	2,344
Interest expense	(3,738)	(2,928)	(7,049)	(5,671)
Total other income (expense), net	8,429	972	5,046	(1,499)
INCOME (LOSS) BEFORE INCOME TAXES	9,011	(2,870)	10,575	(42,071)
INCOME TAX (EXPENSE) BENEFIT	(1,887)	707	(1,765)	1,604
NET INCOME (LOSS)	7,124	(2,163)	8,810	(40,467)
LESS—NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTEREST	108	(162)	138	(359)
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY	7,016	(2,001)	8,672	(40,108)
LESS—EFFECT OF PARTICIPATING SHARE-BASED AWARDS	(149)	0	(155)	0
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY’S COMMON STOCKHOLDERS	$ 6,867	$ (2,001)	$ 8,517	$ (40,108)
NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS:
BASIC (in dollars per share)	$ 0.16	$ (0.05)	$ 0.20	$ (0.91)
DILUTED (in dollars per share)	$ 0.16	$ (0.05)	$ 0.20	$ (0.91)
WEIGHTED AVERAGE SHARES USED TO COMPUTE NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS:
BASIC (in shares)	42,407,888	43,736,366	43,153,486	44,048,017
DILUTED (in shares)	42,418,841	43,736,366	43,158,601	44,048,017

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 7,124	$ (2,163)	$ 8,810	$ (40,467)
Unrealized gains (losses) on marketable securities, net of taxes of $0 and $0, respectively	0	(24)	0	(15)
Foreign currency translation adjustments	(1,352)	765	312	(3,876)
Other comprehensive income (loss)	(1,352)	741	312	(3,891)
Comprehensive income (loss)	5,772	(1,422)	9,122	(44,358)
Less—Comprehensive income (loss) attributable to noncontrolling interest	(184)	(570)	(99)	(570)
Comprehensive income (loss) attributable to the Company	$ 5,956	$ (852)	$ 9,221	$ (43,788)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Taxes on unrealized losses on marketable securities	$ 0	$ 0	$ 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 (in 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 (in shares)		37,966
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased)	(599)					(599)
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased) (in shares)		174,498
Treasury stock purchases	(11,519)					(11,519)
Treasury stock purchases (in shares)		(1,193,657)
Acquisition of noncontrolling interest	(4,171)						(4,171)
Stock compensation expense	2,236		2,236
Other comprehensive income (loss)	(3,891)				(3,321)		(570)
Net income (loss)	(40,467)			(40,108)			(359)
Ending Balance at Jun. 30, 2015	720,663	$ 4	455,757	280,975	(3,332)	(16,530)	3,789
Ending Balance (in shares) at Jun. 30, 2015		43,441,688
Beginning Balance at Dec. 31, 2015	614,010	$ 4	474,367	169,680	(4,009)	(28,762)	2,730
Beginning Balance (in 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 (in shares)		33,973
Issuance of common stock in acquisition	4,050	$ 1	4,049
Issuance of common stock in acquisition (in shares)		500,000
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased)	(752)					(752)
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased) (in shares)		178,285
Partial termination of capped call options	1,588		1,588
Convertible debt extinguishment impact (net of tax impact of $2,144)	(5,085)		(5,085)
Treasury stock purchases	(46,705)					(46,705)
Treasury stock purchases (in shares)		(5,370,771)
Acquisition of noncontrolling interest	(179)						(179)
Stock compensation expense	1,934		1,934
Other comprehensive income (loss)	312				411		(99)
Net income (loss)	8,810			8,672			138
Ending Balance at Jun. 30, 2016	$ 578,299	$ 5	$ 477,169	$ 178,352	$ (3,598)	$ (76,219)	$ 2,590
Ending Balance (in shares) at Jun. 30, 2016		39,179,201

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Equity (unaudited) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Convertible debt extinguishment impact, tax impact	$ 2,144
Restricted stock units
Conversion of restricted stock units to common stock, treasury shares purchased (in shares)	68,424	64,978

Condensed Consolidated Stateme9

Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 8,810	$ (40,467)
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Depreciation expense	15,498	11,747
Amortization expense of assets and liabilities, net	354	213
Gain on involuntary conversion	(4,540)	0
Accretion of convertible note discount	2,462	2,327
Amortization of marketable securities	0	103
Change in fair value of contingent consideration	3,556	(1,828)
Change in fair value of convertible debt conversion liability	(13,432)	0
Gain on debt extinguishment	(2,152)	0
Provision for doubtful accounts	(34)	(986)
Stock compensation expense	1,934	2,236
Deferred tax expense (benefit)	1,709	(1,749)
Other operating activities	(504)	(11)
Changes in asset and liabilities, net of effects from acquisitions:
Accounts receivable, net	213,219	246,260
Inventories	(42,240)	1,473
Prepaid expenses and other assets	(41,158)	(987)
Accounts payable	(150,093)	(141,340)
Accrued expenses and other liabilities	(1,686)	(10,028)
Deferred revenue	1,757	(16,680)
Net cash flows provided by (used in) operating activities	(6,540)	50,283
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash paid for marketable securities	0	(52,153)
Cash received from maturities of marketable securities	0	38,597
Cash receipts for involuntary conversion	4,540	0
Transfer into restricted cash	0	(2,000)
Transfer out of restricted cash	0	12,845
Cash paid for purchase of property, plant and equipment	(27,467)	(27,707)
Cash paid for acquisitions and additional interests, net of cash acquired	(12,720)	(4,171)
Cash paid for investments	(3,249)	0
Other investing activities	376	0
Net cash flows used in investing activities	(38,520)	(34,589)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net borrowings on revolving line of credit	21,373	9,661
Borrowings on other lines of credit	4,081	0
Cash received from notes payable	163,408	411
Cash paid on notes payable	(64,530)	(2,673)
Cash paid for debt issuance costs	(5,329)	(365)
Cash paid for treasury stock	(45,869)	(12,118)
Cash paid for contingent consideration settlement	(1,390)	(1,995)
Net cash flows provided by (used in) financing activities	71,744	(7,079)
NET CHANGE IN CASH AND CASH EQUIVALENTS	26,684	8,615
CASH AND CASH EQUIVALENTS, Beginning of period	47,081	63,516
Effect of exchange rate changes on cash	313	(1,153)
CASH AND CASH EQUIVALENTS, End of period	74,078	70,978
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION:
Cash paid (received) for income taxes	244	(44)
Cash paid for interest	3,976	3,372
Amounts included in period-end accounts payable for:
Purchases of property, plant and equipment	4,135	8,812
Debt issuance cost	34	14
Incentive stock liability for raw material supply agreement	0	159
Issuance of common stock for acquisitions	4,050	0
Contingent consideration for acquisitions	4,500	0
Accruals of insurance proceeds related to impairment of property, plant and equipment	$ 1,414	$ 11,027

Basis of Presentation and Natur

Basis of Presentation and Nature of the Business	6 Months Ended
	Jun. 30, 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 June 30, 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	6 Months Ended
	Jun. 30, 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. Through June 30, 2016 , the Company received approximately $242,139 related to the 2015 biodiesel mixture excise tax credit, which results in $1,650 remaining as outstanding receivables at June 30, 2016. 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. At June 30, 2016 , the Company has received property insurance proceeds of $17,600 , of which $15,567 was related to the property damage. The excess of the property insurance proceeds over the net book value of the impaired assets, $997 and $4,540 , was recorded as gain on involuntary conversion on the Condensed Consolidated Statements of Operations during the three and six months ended June 30, 2016, respectively. 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 June 30, 2016 and December 31, 2015, the Company had goodwill in the Services reporting unit. 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 six months of 2016 that would indicate an additional assessment should be performed. Convertible Debt In June 2016, the Company issued $152,000 aggregate principal amount of 4% convertible senior notes due 2036 (the "2036 Convertible Notes"). The Company may not elect to issue shares of common stock upon conversion of the 2036 Convertible Notes to the extent such election would result in the issuance of more than 19.99% of the common stock outstanding immediately before the issuance of the 2036 Convertible Notes until the Company receives stockholder approval for such issuance. As a result, the embedded conversion option is accounted for as an embedded derivative liability. This liability is recorded at fair value, and a $13,432 fair value adjustment was recorded in the second quarter of 2016. The Company expects to continue marking the embedded conversion option to market until shareholders authorize additional common shares at its Annual Shareholder Meeting in May 2017. See "Note 7 - Debt" for a further description of the transaction. 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 three months ended June 30, 2016 , the Company used all of the remaining available funds of approximately $870 authorized under this program to repurchase 90,654 shares, resulting in total repurchases in the amount of $6,687 for the six months ended June 30, 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 convertible notes 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. During the three and six months ended June 30, 2016, the Company repurchased 4,442,823 shares of Common Stock for $38,429 under this program. 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. In May 2016, the FASB issued ASU 2016-12, which amends certain aspects of the new revenue standard, ASU 2014-09. The amendments address issues such as collectability; presentation of sales tax and other similar taxes collected from customers; noncash consideration; contract modifications and completed contracts at transition; and transition technical correction. 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.

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 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 as of June 30, 2016 . The following table summarizes the consideration paid for the acquisition from Sanimax Energy: March 15, 2016 Consideration at fair value for acquisition from 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 are payable in cash and cannot exceed $1,700 in any one year period beginning March 15, 2016 through 2023 and up to $5,000 in aggregate. As of June 30, 2016 , the Company has recorded a contingent liability of $4,427 , approximately $1,276 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 acquisition from Sanimax Energy was completed as of January 1, 2015. Three Months Three Months Six Months Six Months Revenues $ 558,301 $ 378,571 $ 872,321 $ 614,298 Net income (loss) 6,933 (3,534 ) 8,599 (43,174 ) Basic net income (loss) per share $ 0.16 $ (0.08 ) $ 0.20 $ (0.97 )

Inventories

Inventories	6 Months Ended
	Jun. 30, 2016
Inventory Disclosure [Abstract]
Inventories	INVENTORIES Inventories consist of the following: June 30, 2016 December 31, 2015 Raw materials $ 54,803 $ 28,989 Work in process 3,723 3,014 Finished goods 71,323 53,887 Total $ 129,849 $ 85,890

Other Assets

Other Assets	6 Months Ended
	Jun. 30, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	OTHER ASSETS Prepaid expense and other assets consist of the following: June 30, 2016 December 31, 2015 Commodity derivatives and related collateral, net $ 17,273 $ 10,097 Prepaid expenses 13,323 8,504 Deposits 2,921 3,824 RIN inventory 34,323 5,656 Taxes receivable 2,338 1,814 Other 2,891 1,987 Total $ 73,069 $ 31,882 RIN inventory values were adjusted in the amounts of $2,671 and $3,027 at June 30, 2016 and December 31, 2015 , respectively, to reflect the lower of cost or net realizable value. Other noncurrent assets consist of the following: June 30, 2016 December 31, 2015 Spare parts inventory $ 2,922 $ 2,922 Deposits 2,280 2,370 Other 7,013 6,527 Total $ 12,215 $ 11,819

Intangible Assets

Intangible Assets	6 Months Ended
	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	INTANGIBLE ASSETS Intangible assets consist of the following: June 30, 2016 Cost Accumulated Amortization Net Weighted Average Remaining Life Raw material supply agreement $ 6,230 $ (1,762 ) $ 4,468 9.5 years Renewable hydrocarbon diesel technology 8,300 (1,153 ) 7,147 13.0 years Ground lease 200 (119 ) 81 5.3 years Acquired customer relationships 2,900 (251 ) 2,649 9.1 years Total amortizing intangibles 17,630 (3,285 ) 14,345 In-process research and development, indefinite lives 15,956 — 15,956 Total intangible assets $ 33,586 $ (3,285 ) $ 30,301 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 $323 and $640 for the three and six months ended June 30, 2016 , respectively, and $252 and $489 for the three and six months ended June 30, 2015 , respectively. The estimated intangible asset amortization expense for the remainder of fiscal year 2016 through fiscal year 2022 and thereafter is as follows: July 1, 2016 through December 31, 2016 $ 648 2017 1,302 2018 1,309 2019 1,315 2020 1,322 2021 1,328 2022 and thereafter 7,121 Total $ 14,345

Debt

Debt	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Debt	DEBT The Company’s debt is as follows: June 30, 2016 December 31, 2015 4.00% Convertible Senior Notes, $152,000 face amount, due in June 2036 $ 112,068 $ — 2.75% Convertible Senior Notes, $79,838 face amount, due in June 2019 71,351 126,053 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 9,413 — REG Newton term loan, secured, variable interest rate of LIBOR plus 4%, due in December 2018 14,921 16,800 REG Mason City term loan, fixed interest rate of 5%, due in July 2019 3,213 3,675 REG Ames term loans, secured, fixed interest rates of 3.5% and 4.25%, due in January 2018 and December 2019, respectively 3,735 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 988 908 Total term debt before debt issuance costs 320,914 256,562 Less: Current portion of long-term debt 7,959 5,206 Less: Debt issuance costs (net of accumulated amortization of $2,805 and $2,296, respectively 6,748 4,105 Total long-term debt $ 306,207 $ 247,251 On October 31, 2015, REG Danville, LLC entered into a 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 June 30, 2016 , there was $9,413 outstanding under the Fifth Third Construction/Term Loan. On June 2, 2016, the Company issued $152,000 aggregate principal amount of the 2036 Convertible Notes in a private offering to qualified institutional buyers. The 2036 Convertible Notes bear interest at a rate of 4.00% per year payable semi-annually in arrears on June 15 and December 15 of each year, beginning December 15, 2016. The notes will mature on June 15, 2036, unless repurchased, redeemed or converted in accordance with their terms prior to such date. Prior to December 15, 2035, the 2036 Convertible Notes will be convertible only upon satisfaction of certain conditions and during certain periods as stipulated in the indenture. On or after December 15, 2035 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders of the 2036 Convertible Notes may convert their notes at any time. Unless and until the Company obtains stockholder approval under applicable NASDAQ Stock Market rules, the 2036 Convertible Notes will be convertible, subject to certain conditions, into cash. If the Company obtains such stockholder approval, the 2036 Convertible Notes may be settled in cash, the Company’s common shares or a combination of cash and the Company’s common shares, at the Company’s election. The Company may not redeem the 2036 Convertible Notes prior to June 15, 2021. Holders of the 2036 Convertible Notes will have the right to require the Company to repurchase for cash all or some of their notes at 100% of their principal, plus any accrued and unpaid interest on each of June 15, 2021, June 15, 2026 and June 15, 2031. Holders of the 2036 Convertible Notes will have the right to require the Company to repurchase for cash all or some of their notes at 100% of their principal, plus any accrued and unpaid interest upon the occurrence of certain fundamental changes. The initial conversion rate is 92.8074 common shares per $1,000 (one thousand) principal amount of 2036 Convertible Notes (equivalent to an initial conversion price of approximately $10.78 per common share). The net proceeds from the offering of the 2036 Convertible Notes were approximately $147,118 , after deducting fees and offering expenses of $4,882 , which was capitalized as debt issuance costs and is being amortized through June 2036. The Company evaluated the terms of the conversion features under the applicable accounting literature, including Derivatives and Hedging, ASC 815, and determined that a certain feature required separate accounting as a derivative. This derivative was recorded as a long-term liability, "Convertible Debt Conversion Liability" on the Condensed Consolidated Balance Sheets and will be adjusted to reflect fair value each reporting date. The fair value of the convertible debt conversion liability at issuance was $40,145 . The fair value of the convertible debt conversion liability at June 30, 2016 was $26,713 . The Company recognized a gain of $13,432 , which is reflected in the "Change in Fair Value of Convertible Debt Conversion Liability" on the Condensed Consolidated Statements of Operations. As a result, the debt liability component of 2036 Convertible Notes was determined to be $111,855 at issuance, reflecting a debt discount of $40,145 . The debt discount is to be amortized through June 2036. The effective interest rate on the debt liability component was 2.45% . Approximately $35,101 of the net proceeds from the offering of the 2036 Convertible Notes were used to repurchase 4,060,323 shares of the Company's Common Stock in privately negotiated transactions. In addition, approximately $61,954 of the net proceeds from the offering were used to repurchase $63,912 principal amount of the Company's 2.75% convertible senior notes due 2019 (the "2019 Convertible Notes") in privately negotiated transactions, resulting in a gain on debt extinguishment of $2,152 , which is reflected on the Condensed Consolidated Statements of Operations. Lines of Credit June 30, 2016 December 31, 2015 Amount outstanding under lines of credit $ 48,603 $ 23,149 Maximum available to be borrowed under lines of credit $ 9,661 $ 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	6 Months Ended
	Jun. 30, 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, now known as Landus Cooperative ("Landus"), is no longer a related party because it does not hold ten percent or more of the Company’s outstanding Common Stock, and no longer has the right to a seat on the Company's board for the three and six months ended June 30, 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 and six months ended June 30, 2015 , primarily related to raw material purchases at market prices. This amount was included in the "Costs of goods sold - Biomass-based diesel" on the Condensed Consolidated Statements of Operations.

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	DERIVATIVE INSTRUMENTS The Company enters into New York Mercantile Exchange NY Harbor ULSD and CBOT 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 cash 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, 2016 , the net notional volumes of New York Mercantile Exchange NY Harbor ULSD and CBOT Soybean Oil covered under the open commodity derivative contracts were approximately 127 million gallons and 194 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: June 30, 2016 December 31, 2015 Assets Liabilities Assets Liabilities Gross amounts of derivatives recognized at fair value $ 2,324 $ 9,388 $ 4,644 $ 185 Cash collateral 24,337 — 5,638 — Total gross amount recognized 26,661 9,388 10,282 185 Gross amounts offset (9,388 ) (9,388 ) (185 ) (185 ) Net amount reported in the condensed consolidated balance sheets $ 17,273 $ — $ 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 Six Months Six Months Commodity derivatives Cost of goods sold – Biomass-based diesel $ (30,527 ) $ (3,570 ) $ (34,796 ) $ (3,990 )

Fair Value Measurement

Fair Value Measurement	6 Months Ended
	Jun. 30, 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 June 30, 2016 Total Level 1 Level 2 Level 3 Commodity contract derivatives $ (7,064 ) $ (3,438 ) $ (3,626 ) $ — Convertible debt conversion liability (26,713 ) — (26,713 ) — Contingent considerations for acquisitions (48,378 ) — — (48,378 ) $ (82,155 ) $ (3,438 ) $ (30,339 ) $ (48,378 ) 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 2016 2015 Balance at beginning of period, January 1 $ 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, March 31 45,616 38,560 Change in estimates included in earnings 3,571 (2,121 ) Settlements (809 ) (943 ) Balance at end of period, June 30 $ 48,378 $ 35,496 The estimated fair values of the Company’s financial instruments, which are not recorded at fair value, are as follows: As of June 30, 2016 As of December 31, 2015 Asset (Liability) Fair Value Asset (Liability) Fair Value Financial liabilities: Debt and lines of credit $ (362,769 ) $ (361,993 ) $ (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. Convertible debt conversion liability: The fair value of the convertible debt conversion liability is estimated using the Black-Scholes model incorporating the terms and conditions of the 2036 Convertible Notes and considering changes in the prices of the company's common stock, company stock price volatility, risk-free rates and changes in market rates. The valuations are, among other things, subject to changes in the Company's credit worthiness as well as change in general market conditions. As the majority of the assumptions used in the calculations are based on market sources, the fair value of the convertible conversion liability is reflected in Level 2. 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, 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 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 2,251,132 2,433,636 2,422,353 2,119,168 2019 Convertible notes 9,302,579 10,838,218 10,070,399 10,838,218 2036 Convertible notes 4,495,550 — 2,247,775 — Total 16,136,287 13,358,880 14,827,553 13,044,412 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 $ 6,867 $ (2,001 ) $ 8,517 $ (40,108 ) Less: effect of participating securities — — — — Net income (loss) attributable to common stockholders - Dilutive $ 6,867 $ (2,001 ) $ 8,517 $ (40,108 ) Shares: Weighted-average shares used to compute basic net income (loss) per share 42,407,888 43,736,366 43,153,486 44,048,017 Adjustment to reflect stock appreciation right conversions 10,953 — 5,115 — Weighted-average shares used to compute diluted net income (loss) per share 42,418,841 43,736,366 43,158,601 44,048,017 Net income (loss) per share attributable to common stockholders: Diluted $ 0.16 $ (0.05 ) $ 0.20 $ (0.91 )

Reportable Segments and Geograp

Reportable Segments and Geographic Information	6 Months Ended
	Jun. 30, 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 June 30, 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 from services provided to other segments 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. 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 Six Months Six Months Net revenues: Biomass-based Diesel (includes Petrotec's net sales of $45,748 and $82,667 and $38,081 and $68,074 for the three and six months ended June 30, 2016 and 2015, respectively) $ 539,631 $ 363,101 $ 832,393 $ 587,289 Services 21,396 27,923 42,133 43,394 Renewable Chemicals 1,000 — 1,000 — Corporate and Other 23,643 15,220 40,631 22,562 Intersegment revenues (27,369 ) (32,482 ) (52,262 ) (48,565 ) $ 558,301 $ 373,762 $ 863,895 $ 604,680 Income (loss) before income taxes: Biomass-based Diesel (includes Petrotec's income (loss) of $1,183 and $1,616 and ($906) and ($2,008) for the three and six months ended June 30, 2016 and 2015, respectively) $ (3,591 ) $ 3,576 $ 9,269 $ (28,100 ) Services 1,261 202 1,834 252 Renewable Chemicals (3,924 ) (4,316 ) (8,605 ) (8,207 ) Corporate and other 15,265 (2,332 ) 8,077 (6,016 ) $ 9,011 $ (2,870 ) $ 10,575 $ (42,071 ) Depreciation and amortization expense, net: Biomass-based Diesel (includes Petrotec's amounts of $594 and $1,445 and $915 and $1,602 for the three and six months ended June 30, 2016 and 2015, respectively) $ 7,140 $ 5,454 $ 14,068 $ 10,425 Services 117 76 213 137 Renewable Chemicals 368 319 782 662 Corporate and other 392 385 789 736 $ 8,017 $ 6,234 $ 15,852 $ 11,960 Cash paid for purchases of property, plant and equipment: Biomass-based Diesel (includes Petrotec's amounts of $374 and $374 and $659 and $977 for the three and six months ended June 30, 2016 and 2015, respectively) $ 11,895 $ 14,889 $ 25,499 $ 25,092 Services — 403 1,166 1,125 Renewable Chemicals 619 163 619 304 Corporate and other 183 75 183 1,186 $ 12,697 $ 15,530 $ 27,467 $ 27,707 June 30, 2016 December 31, 2015 Goodwill: Services $ 16,080 $ 16,080 Assets: Biomass-based Diesel (including Petrotec's assets of $52,273 and $45,471, respectively) $ 888,175 $ 1,048,923 Services 49,913 60,308 Renewable Chemicals 24,657 23,872 Corporate and other 379,867 308,782 Intersegment eliminations (189,122 ) (218,265 ) $ 1,153,490 $ 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. Three Months Three Months Six Months Six Months Net revenues: United States $ 512,553 $ 335,681 $ 781,228 $ 536,606 Foreign 45,748 38,081 82,667 68,074 $ 558,301 $ 373,762 $ 863,895 $ 604,680 June 30, 2016 December 31, 2015 Long-lived assets: United States $ 582,983 $ 553,987 Foreign 19,426 20,597 $ 602,409 $ 574,584

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 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.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS The Company's subsidiary, REG Geismar, LLC, or REG Geismar, is the obligor with respect to $100,000 aggregate principal amount of Gulf Opportunity Zone tax-exempt bonds, or GOZone Bonds, due in October 2033, through a loan agreement with the Louisiana Public Facilities Authority. REG Geismar’s payment obligations on the GOZone Bonds are supported by a letter of credit issued by a financial institution. REG Geismar is party to an agreement to reimburse the financial institution for any draws on the letter of credit and that obligation is secured by a $101,315 certificate of deposit by us and pledged in favor of the financial institution. On July 29, 2016, REG Geismar caused the Louisiana Public Facilities Authority to call for redemption all of the outstanding GOZone Bonds as of September 6, 2016. The redemption will be funded by application of the funds generated by release of the certificate of deposit.

Summary of Significant Accoun24

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 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. Through June 30, 2016 , the Company received approximately $242,139 related to the 2015 biodiesel mixture excise tax credit, which results in $1,650 remaining as outstanding receivables at June 30, 2016.
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. At June 30, 2016 , the Company has received property insurance proceeds of $17,600 , of which $15,567 was related to the property damage. The excess of the property insurance proceeds over the net book value of the impaired assets, $997 and $4,540 , was recorded as gain on involuntary conversion on the Condensed Consolidated Statements of Operations during the three and six months ended June 30, 2016, respectively. 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 June 30, 2016 and December 31, 2015, the Company had goodwill in the Services reporting unit. 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 six months of 2016 that would indicate an additional assessment should be performed.
Convertible Debt	Convertible Debt In June 2016, the Company issued $152,000 aggregate principal amount of 4% convertible senior notes due 2036 (the "2036 Convertible Notes"). The Company may not elect to issue shares of common stock upon conversion of the 2036 Convertible Notes to the extent such election would result in the issuance of more than 19.99% of the common stock outstanding immediately before the issuance of the 2036 Convertible Notes until the Company receives stockholder approval for such issuance. As a result, the embedded conversion option is accounted for as an embedded derivative liability. This liability is recorded at fair value, and a $13,432 fair value adjustment was recorded in the second quarter of 2016. The Company expects to continue marking the embedded conversion option to market until shareholders authorize additional common shares at its Annual Shareholder Meeting in May 2017. See "Note 7 - Debt" for a further description of the transaction.
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 three months ended June 30, 2016 , the Company used all of the remaining available funds of approximately $870 authorized under this program to repurchase 90,654 shares, resulting in total repurchases in the amount of $6,687 for the six months ended June 30, 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 convertible notes 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. During the three and six months ended June 30, 2016, the Company repurchased 4,442,823 shares of Common Stock for $38,429 under this program.
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. In May 2016, the FASB issued ASU 2016-12, which amends certain aspects of the new revenue standard, ASU 2014-09. The amendments address issues such as collectability; presentation of sales tax and other similar taxes collected from customers; noncash consideration; contract modifications and completed contracts at transition; and transition technical correction. 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.

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2016
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Information	The following pro forma condensed combined results of operations assume that the acquisition from Sanimax Energy was completed as of January 1, 2015. Three Months Three Months Six Months Six Months Revenues $ 558,301 $ 378,571 $ 872,321 $ 614,298 Net income (loss) 6,933 (3,534 ) 8,599 (43,174 ) Basic net income (loss) per share $ 0.16 $ (0.08 ) $ 0.20 $ (0.97 )
Sanimax Energy, LLC
Business Acquisition [Line Items]
Schedule of Business Acquisitions	The following table summarizes the consideration paid for the acquisition from Sanimax Energy: March 15, 2016 Consideration at fair value for acquisition from 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)	6 Months Ended
	Jun. 30, 2016
Inventory Disclosure [Abstract]
Inventories	Inventories consist of the following: June 30, 2016 December 31, 2015 Raw materials $ 54,803 $ 28,989 Work in process 3,723 3,014 Finished goods 71,323 53,887 Total $ 129,849 $ 85,890

Other Assets (Tables)

Other Assets (Tables)	6 Months Ended
	Jun. 30, 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: June 30, 2016 December 31, 2015 Commodity derivatives and related collateral, net $ 17,273 $ 10,097 Prepaid expenses 13,323 8,504 Deposits 2,921 3,824 RIN inventory 34,323 5,656 Taxes receivable 2,338 1,814 Other 2,891 1,987 Total $ 73,069 $ 31,882
Summary of Other Noncurrent Assets	Other noncurrent assets consist of the following: June 30, 2016 December 31, 2015 Spare parts inventory $ 2,922 $ 2,922 Deposits 2,280 2,370 Other 7,013 6,527 Total $ 12,215 $ 11,819

Intangible Assets (Tables)

Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Components of Intangible assets	Intangible assets consist of the following: June 30, 2016 Cost Accumulated Amortization Net Weighted Average Remaining Life Raw material supply agreement $ 6,230 $ (1,762 ) $ 4,468 9.5 years Renewable hydrocarbon diesel technology 8,300 (1,153 ) 7,147 13.0 years Ground lease 200 (119 ) 81 5.3 years Acquired customer relationships 2,900 (251 ) 2,649 9.1 years Total amortizing intangibles 17,630 (3,285 ) 14,345 In-process research and development, indefinite lives 15,956 — 15,956 Total intangible assets $ 33,586 $ (3,285 ) $ 30,301 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: July 1, 2016 through December 31, 2016 $ 648 2017 1,302 2018 1,309 2019 1,315 2020 1,322 2021 1,328 2022 and thereafter 7,121 Total $ 14,345

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Company's Borrowings	The Company’s debt is as follows: June 30, 2016 December 31, 2015 4.00% Convertible Senior Notes, $152,000 face amount, due in June 2036 $ 112,068 $ — 2.75% Convertible Senior Notes, $79,838 face amount, due in June 2019 71,351 126,053 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 9,413 — REG Newton term loan, secured, variable interest rate of LIBOR plus 4%, due in December 2018 14,921 16,800 REG Mason City term loan, fixed interest rate of 5%, due in July 2019 3,213 3,675 REG Ames term loans, secured, fixed interest rates of 3.5% and 4.25%, due in January 2018 and December 2019, respectively 3,735 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 988 908 Total term debt before debt issuance costs 320,914 256,562 Less: Current portion of long-term debt 7,959 5,206 Less: Debt issuance costs (net of accumulated amortization of $2,805 and $2,296, respectively 6,748 4,105 Total long-term debt $ 306,207 $ 247,251
Revolving Line of Credit	Lines of Credit June 30, 2016 December 31, 2015 Amount outstanding under lines of credit $ 48,603 $ 23,149 Maximum available to be borrowed under lines of credit $ 9,661 $ 23,067

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 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: June 30, 2016 December 31, 2015 Assets Liabilities Assets Liabilities Gross amounts of derivatives recognized at fair value $ 2,324 $ 9,388 $ 4,644 $ 185 Cash collateral 24,337 — 5,638 — Total gross amount recognized 26,661 9,388 10,282 185 Gross amounts offset (9,388 ) (9,388 ) (185 ) (185 ) Net amount reported in the condensed consolidated balance sheets $ 17,273 $ — $ 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 Six Months Six Months Commodity derivatives Cost of goods sold – Biomass-based diesel $ (30,527 ) $ (3,570 ) $ (34,796 ) $ (3,990 )

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2016 Total Level 1 Level 2 Level 3 Commodity contract derivatives $ (7,064 ) $ (3,438 ) $ (3,626 ) $ — Convertible debt conversion liability (26,713 ) — (26,713 ) — Contingent considerations for acquisitions (48,378 ) — — (48,378 ) $ (82,155 ) $ (3,438 ) $ (30,339 ) $ (48,378 ) 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 2016 2015 Balance at beginning of period, January 1 $ 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, March 31 45,616 38,560 Change in estimates included in earnings 3,571 (2,121 ) Settlements (809 ) (943 ) Balance at end of period, June 30 $ 48,378 $ 35,496
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, 2016 As of December 31, 2015 Asset (Liability) Fair Value Asset (Liability) Fair Value Financial liabilities: Debt and lines of credit $ (362,769 ) $ (361,993 ) $ (279,711 ) $ (275,123 )

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	6 Months Ended
	Jun. 30, 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 Six Months Six Months Options to purchase common stock 87,026 87,026 87,026 87,026 Stock appreciation rights 2,251,132 2,433,636 2,422,353 2,119,168 2019 Convertible notes 9,302,579 10,838,218 10,070,399 10,838,218 2036 Convertible notes 4,495,550 — 2,247,775 — Total 16,136,287 13,358,880 14,827,553 13,044,412
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 $ 6,867 $ (2,001 ) $ 8,517 $ (40,108 ) Less: effect of participating securities — — — — Net income (loss) attributable to common stockholders - Dilutive $ 6,867 $ (2,001 ) $ 8,517 $ (40,108 ) Shares: Weighted-average shares used to compute basic net income (loss) per share 42,407,888 43,736,366 43,153,486 44,048,017 Adjustment to reflect stock appreciation right conversions 10,953 — 5,115 — Weighted-average shares used to compute diluted net income (loss) per share 42,418,841 43,736,366 43,158,601 44,048,017 Net income (loss) per share attributable to common stockholders: Diluted $ 0.16 $ (0.05 ) $ 0.20 $ (0.91 )

Reportable Segments and Geogr33

Reportable Segments and Geographic Information (Tables)	6 Months Ended
	Jun. 30, 2016
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 (includes Petrotec's net sales of $45,748 and $82,667 and $38,081 and $68,074 for the three and six months ended June 30, 2016 and 2015, respectively) $ 539,631 $ 363,101 $ 832,393 $ 587,289 Services 21,396 27,923 42,133 43,394 Renewable Chemicals 1,000 — 1,000 — Corporate and Other 23,643 15,220 40,631 22,562 Intersegment revenues (27,369 ) (32,482 ) (52,262 ) (48,565 ) $ 558,301 $ 373,762 $ 863,895 $ 604,680 Income (loss) before income taxes: Biomass-based Diesel (includes Petrotec's income (loss) of $1,183 and $1,616 and ($906) and ($2,008) for the three and six months ended June 30, 2016 and 2015, respectively) $ (3,591 ) $ 3,576 $ 9,269 $ (28,100 ) Services 1,261 202 1,834 252 Renewable Chemicals (3,924 ) (4,316 ) (8,605 ) (8,207 ) Corporate and other 15,265 (2,332 ) 8,077 (6,016 ) $ 9,011 $ (2,870 ) $ 10,575 $ (42,071 ) Depreciation and amortization expense, net: Biomass-based Diesel (includes Petrotec's amounts of $594 and $1,445 and $915 and $1,602 for the three and six months ended June 30, 2016 and 2015, respectively) $ 7,140 $ 5,454 $ 14,068 $ 10,425 Services 117 76 213 137 Renewable Chemicals 368 319 782 662 Corporate and other 392 385 789 736 $ 8,017 $ 6,234 $ 15,852 $ 11,960 Cash paid for purchases of property, plant and equipment: Biomass-based Diesel (includes Petrotec's amounts of $374 and $374 and $659 and $977 for the three and six months ended June 30, 2016 and 2015, respectively) $ 11,895 $ 14,889 $ 25,499 $ 25,092 Services — 403 1,166 1,125 Renewable Chemicals 619 163 619 304 Corporate and other 183 75 183 1,186 $ 12,697 $ 15,530 $ 27,467 $ 27,707 June 30, 2016 December 31, 2015 Goodwill: Services $ 16,080 $ 16,080 Assets: Biomass-based Diesel (including Petrotec's assets of $52,273 and $45,471, respectively) $ 888,175 $ 1,048,923 Services 49,913 60,308 Renewable Chemicals 24,657 23,872 Corporate and other 379,867 308,782 Intersegment eliminations (189,122 ) (218,265 ) $ 1,153,490 $ 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. Three Months Three Months Six Months Six Months Net revenues: United States $ 512,553 $ 335,681 $ 781,228 $ 536,606 Foreign 45,748 38,081 82,667 68,074 $ 558,301 $ 373,762 $ 863,895 $ 604,680 June 30, 2016 December 31, 2015 Long-lived assets: United States $ 582,983 $ 553,987 Foreign 19,426 20,597 $ 602,409 $ 574,584

Basis of Presentation and Nat34

Basis of Presentation and Nature of the Business (Details) gal in Millions	6 Months Ended
	Jun. 30, 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 Accoun35

Summary of Significant Accounting Policies (Details) - USD ($)	Oct. 31, 2015	Jul. 31, 2015	Sep. 30, 2015	Apr. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 02, 2016	Mar. 31, 2016	Dec. 31, 2015	Feb. 28, 2015
Business Acquisition [Line Items]
Biomass-based diesel government incentives					$ 97,153,000	$ 7,278,000	$ 155,554,000	$ 17,066,000
Accounts receivable, net					97,493,000		97,493,000				$ 310,731,000
Estimated impaired fixed assets			$ 1,414,000	$ 11,027,000			15,567,000
Insurance recoveries							17,600,000
Gain on involuntary conversion					997,000	$ 0	4,540,000	0
Change in fair value of convertible debt conversion liability					13,432,000		(13,432,000)	$ 0
February 2,015
Business Acquisition [Line Items]
Share repurchase program, amount authorized to be repurchased												$ 30,000,000
Stock repurchase program, amount repurchased					$ 870,000		6,687,000
Stock repurchase program, shares repurchased (in shares)					90,654
March 2,016
Business Acquisition [Line Items]
Share repurchase program, amount authorized to be repurchased										$ 50,000,000
Stock repurchase program, amount repurchased					$ 38,429,000		$ 38,429,000
Stock repurchase program, shares repurchased (in shares)					4,442,823		4,442,823
2036 Convertible Notes | Convertible Debt
Business Acquisition [Line Items]
Face amount					$ 152,000,000		$ 152,000,000		$ 152,000,000
Interest rate					4.00%		4.00%
Stock repurchase program, shares repurchased (in shares)							4,060,323
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]
Biomass-based diesel government incentives							$ 242,139,000
Accounts receivable, net					$ 1,650,000		$ 1,650,000

Acquisitions (Details Textual)

Acquisitions (Details Textual) $ in Thousands, gal in Millions	Mar. 15, 2016USD ($)sharesgal	Jun. 30, 2016USD ($)gal	Dec. 31, 2015USD ($)
Business Acquisition [Line Items]
Production capacity per year | gal		452
Contingent consideration for acquisitions		$ 34,366	$ 26,949
Sanimax Energy, LLC
Business Acquisition [Line Items]
Production capacity per year | gal	20	20
Shares of common stock issued (in shares) | shares	500,000
Contingent consideration for acquisitions	$ 5,000	$ 4,427
Earnout payment period	7 years
Maximum Earnout Payment per year	$ 1,700
Current contingent liability		$ 1,276

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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Business Combinations [Abstract]
Revenues	$ 558,301	$ 378,571	$ 872,321	$ 614,298
Net income (loss)	$ 6,933	$ (3,534)	$ 8,599	$ (43,174)
Basic net income (loss) per share (in dollars per share)	$ 0.16	$ (0.08)	$ 0.20	$ (0.97)

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Inventories
Raw materials	$ 54,803	$ 28,989
Work in process	3,723	3,014
Finished goods	71,323	53,887
Total	$ 129,849	$ 85,890

Other Assets (Details)

Other Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Summary of prepaid expense and other assets
Commodity derivatives and related collateral, net	$ 17,273	$ 10,097
Prepaid expenses	13,323	8,504
Deposits	2,921	3,824
RIN inventory	34,323	5,656
Taxes receivable	2,338	1,814
Other	2,891	1,987
Total	$ 73,069	$ 31,882

Other Assets (Details Textual)

Other Assets (Details Textual) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Other Assets [Abstract]
Inventory reduced to lower of cost or market	$ 2,671	$ 3,027

Other Assets (Details 1)

Other Assets (Details 1) - USD ($) $ in Thousands	Jun. 30, 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	7,013	6,527
Total	$ 12,215	$ 11,819

Intangible Assets (Details)

Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	$ 17,630	$ 17,630
Accumulated Amortization, finite-lived	(3,285)	(2,645)
Total	14,345	14,985
Cost, indefinite lived	33,586	33,586
Accumulated Amortization, indefinite-lived	(3,285)	(2,645)
Net, indefinite-lived	30,301	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	(1,762)	(1,551)
Total	$ 4,468	$ 4,679
Weighted Average Remaining Life	9 years 6 months	10 years
Renewable hydrocarbon diesel technology
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	$ 8,300	$ 8,300
Accumulated Amortization, finite-lived	(1,153)	(876)
Total	$ 7,147	$ 7,424
Weighted Average Remaining Life	13 years	13 years 6 months
Ground lease
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	$ 200	$ 200
Accumulated Amortization, finite-lived	(119)	(112)
Total	$ 81	$ 88
Weighted Average Remaining Life	5 years 3 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	(251)	(106)
Total	$ 2,649	$ 2,794
Weighted Average Remaining Life	9 years 1 month	9 years 7 months

Intangible Assets (Details Text

Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible amortization expense	$ 323	$ 252	$ 640	$ 489

Intangible Assets (Details 1)

Intangible Assets (Details 1) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Estimated amortization expense
July 1, 2016 through December 31, 2016	$ 648
2,017	1,302
2,018	1,309
2,019	1,315
2,020	1,322
2,021	1,328
2022 and thereafter	7,121
Total	$ 14,345	$ 14,985

Debt (Details)

Debt (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Accumulated amortization on debt issuance costs	$ 2,805,000	$ 2,296,000
Company's borrowings
Total term debt before debt issuance costs	320,914,000	256,562,000
Less: Current portion of long-term debt	7,959,000	5,206,000
Less: Debt issuance costs (net of accumulated amortization of $2,805 and $2,296, respectively	6,748,000	4,105,000
Total long-term debt	$ 306,207,000	247,251,000
4.00% Convertible Senior Notes
Line of Credit Facility [Line Items]
Interest rate	4.00%
Face amount	$ 152,000
Company's borrowings
Total term debt before debt issuance costs	$ 112,068,000	$ 0
Convertible Debt
Line of Credit Facility [Line Items]
Interest rate	2.75%	2.75%
Face amount	$ 79,838,000	$ 79,838,000
Company's borrowings
Total term debt before debt issuance costs	71,351,000	126,053,000
REG Geismar GOZone bonds
Company's borrowings
Total term debt before debt issuance costs	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 term debt before debt issuance costs	$ 9,413,000	$ 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 term debt before debt issuance costs	$ 14,921,000	$ 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 term debt before debt issuance costs	$ 3,213,000	$ 3,675,000
REG Ames term loans
Company's borrowings
Total term debt before debt issuance costs	$ 3,735,000	$ 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 term debt before debt issuance costs	$ 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 term debt before debt issuance costs	$ 988,000	$ 908,000

Debt (Details Textual)

Debt (Details Textual) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Jun. 02, 2016
Debt Instrument [Line Items]
Notes payable	$ 320,914,000		$ 320,914,000		$ 256,562,000
Convertible debt conversion liability	26,713,000		26,713,000		0
Change in fair value of convertible debt conversion liability	13,432,000	$ 0	13,432,000	$ 0
Gain on debt extinguishment	2,152,000	$ 0	2,152,000	$ 0
REG Danville term loan
Debt Instrument [Line Items]
Face amount	12,000,000		$ 12,000,000
Debt instrument term			3 years
Monthly principal payment			$ 212,000
Notes payable	9,413,000		$ 9,413,000		$ 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		$ 30,000,000
2036 Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Face amount	$ 152,000,000		$ 152,000,000			$ 152,000,000
Notes payable						111,855,000
Interest rate	4.00%		4.00%
Percentage of convertible senior notes principal required for repurchase	100.00%		100.00%
Initial conversion rate			92.8074
Iniitial conversion price (in dollars per share)	$ 10.78		$ 10.78
Net proceeds from debt issuance	$ 147,118,000		$ 147,118,000
Fees and offering expenses	4,882,000		4,882,000
Convertible debt conversion liability	$ 26,713,000		26,713,000			$ 40,145,000
Change in fair value of convertible debt conversion liability			13,432,000
Debt discount			$ 40,145,000
Effective interest rate	2.45%		2.45%
Proceeds from offering used to repurchase shares of Common Stock			$ 35,101,000
Stock repurchase program, shares repurchased (in shares)			4,060,323
2019 Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Interest rate	2.75%		2.75%
Net proceeds from debt issuance	$ 61,954,000		$ 61,954,000
Principal amount of debt repurchased			63,912,000
Gain on debt extinguishment			$ 2,152,000

Debt (Details 1)

Debt (Details 1) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Amount outstanding under lines of credit	$ 48,603	$ 23,149
Maximum available to be borrowed under lines of credit	$ 9,661	$ 23,067

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Related Party Transaction [Line Items]
Biomass-based diesel—related parties	$ 0	$ 0	$ 0	$ 4,542
Landus
Related Party Transaction [Line Items]
Biomass-based diesel—related parties		$ 4,542		$ 4,542

Derivative Instruments (Details

Derivative Instruments (Details Textual) lb in Millions, gal in Millions	6 Months Ended
	Jun. 30, 2016lbgal
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Heating oil covered under the open commodity derivative contracts (in gallons) | gal	127
Soybean oil covered under the open commodity derivative contracts (in pounds) | lb	194

Derivative Instruments (Detai51

Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets
Gross amounts of derivatives recognized at fair value	$ 2,324	$ 4,644
Cash collateral	24,337	5,638
Total gross amount recognized	26,661	10,282
Gross amounts offset	(9,388)	(185)
Net amount reported in the condensed consolidated balance sheets	17,273	10,097
Liabilities
Gross amounts of derivatives recognized at fair value	9,388	185
Cash collateral	0	0
Total gross amount recognized	9,388	185
Gross amounts offset	(9,388)	(185)
Net amount reported in the condensed consolidated balance sheets	$ 0	$ 0

Derivative Instruments (Detai52

Derivative Instruments (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 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	$ (30,527)	$ (3,570)	$ (34,796)	$ (3,990)

Fair Value Measurement (Details

Fair Value Measurement (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	$ (82,155)	$ (37,253)
Level 1
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(3,438)	2,196
Level 2
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(30,339)	2,263
Level 3
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(48,378)	(41,712)
Commodity contract derivatives
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(7,064)	4,459
Commodity contract derivatives | Level 1
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(3,438)	2,196
Commodity contract derivatives | Level 2
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(3,626)	2,263
Commodity contract derivatives | Level 3
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	0	0
Convertible debt conversion liability
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(26,713)
Convertible debt conversion liability | Level 1
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	0
Convertible debt conversion liability | Level 2
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(26,713)
Convertible debt conversion liability | Level 3
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	0
Contingent considerations for acquisitions
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	(48,378)	(41,712)
Contingent considerations for acquisitions | Level 1
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	0	0
Contingent considerations for acquisitions | Level 2
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	0	0
Contingent considerations for acquisitions | Level 3
Assets (liabilities) measured at fair value
Assets (liabilities), fair value	$ (48,378)	$ (41,712)

Fair Value Measurement (Detai54

Fair Value Measurement (Details 1) - Contingent Consideration for Acquisition - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 45,616	$ 41,712	$ 38,560	$ 39,319
Fair value of contingent consideration at measurement date		4,500		0
Change in estimates included in earnings	3,571	(15)	(2,121)	293
Settlements	(809)	(581)	(943)	(1,052)
Ending balance	$ 48,378	$ 45,616	$ 35,496	$ 38,560

Fair Value Measurement (Detai55

Fair Value Measurement (Details 2) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Asset (Liability) Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt and lines of credit	$ (362,769)	$ (279,711)
Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt and lines of credit	$ (361,993)	$ (275,123)

Fair Value Measurement (Detai56

Fair Value Measurement (Details Textual)	6 Months Ended
	Jun. 30, 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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	16,136,287	13,358,880	14,827,553	13,044,412
Stock appreciation rights
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	2,251,132	2,433,636	2,422,353	2,119,168
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	87,026	87,026	87,026	87,026
2019 Convertible notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	9,302,579	10,838,218	10,070,399	10,838,218
2036 Convertible notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	4,495,550	0	2,247,775	0

Net Income (Loss) Per Share (58

Net Income (Loss) Per Share (Details 1) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY’S COMMON STOCKHOLDERS	$ 6,867	$ (2,001)	$ 8,517	$ (40,108)
Less: effect of participating securities	0	0	0	0
Net income (loss) attributable to common stockholders - Dilutive	$ 6,867	$ (2,001)	$ 8,517	$ (40,108)
Shares:
Weighted-average shares used to compute basic net income (loss) per share (in shares)	42,407,888	43,736,366	43,153,486	44,048,017
Adjustment to reflect stock appreciation right conversions (in shares)	10,953	0	5,115	0
Weighted-average shares used to compute diluted net income (loss) per share (in shares)	42,418,841	43,736,366	43,158,601	44,048,017
Net income (loss) per share attributable to common stockholders:
Diluted (in usd per share)	$ 0.16	$ (0.05)	$ 0.20	$ (0.91)

Reportable Segments and Geogr59

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 Geogr60

Reportable Segments and Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net revenues	$ 558,301	$ 373,762	$ 863,895	$ 604,680
Income (loss) before income taxes	9,011	(2,870)	10,575	(42,071)
Depreciation and amortization expense, net	8,017	6,234	15,852	11,960
Cash paid for purchases of property, plant and equipment	12,697	15,530	27,467	27,707
Goodwill	16,080		16,080		$ 16,080
Assets	1,153,490		1,153,490		1,223,620
Intersegment revenues
Segment Reporting Information [Line Items]
Net revenues	(27,369)	(32,482)	(52,262)	(48,565)
Assets	(189,122)		(189,122)		(218,265)
Biomass-based Diesel | Segments
Segment Reporting Information [Line Items]
Net revenues	539,631	363,101	832,393	587,289
Income (loss) before income taxes	(3,591)	3,576	9,269	(28,100)
Depreciation and amortization expense, net	7,140	5,454	14,068	10,425
Cash paid for purchases of property, plant and equipment	11,895	14,889	25,499	25,092
Assets	888,175		888,175		1,048,923
Biomass-based Diesel | Segments | Petrotec
Segment Reporting Information [Line Items]
Net revenues	45,748	38,081	82,667	68,074
Income (loss) before income taxes	1,183	(906)	1,616	(2,008)
Depreciation and amortization expense, net	594	915	1,445	1,602
Cash paid for purchases of property, plant and equipment	374	659	374	977
Assets	52,273		52,273		45,471
Services
Segment Reporting Information [Line Items]
Goodwill	16,080		16,080		16,080
Services | Segments
Segment Reporting Information [Line Items]
Net revenues	21,396	27,923	42,133	43,394
Income (loss) before income taxes	1,261	202	1,834	252
Depreciation and amortization expense, net	117	76	213	137
Cash paid for purchases of property, plant and equipment	0	403	1,166	1,125
Assets	49,913		49,913		60,308
Renewable Chemicals | Segments
Segment Reporting Information [Line Items]
Net revenues	1,000	0	1,000	0
Income (loss) before income taxes	(3,924)	(4,316)	(8,605)	(8,207)
Depreciation and amortization expense, net	368	319	782	662
Cash paid for purchases of property, plant and equipment	619	163	619	304
Assets	24,657		24,657		23,872
Corporate and Other
Segment Reporting Information [Line Items]
Net revenues	23,643	15,220	40,631	22,562
Income (loss) before income taxes	15,265	(2,332)	8,077	(6,016)
Depreciation and amortization expense, net	392	385	789	736
Cash paid for purchases of property, plant and equipment	183	$ 75	183	$ 1,186
Assets	$ 379,867		$ 379,867		$ 308,782

Reportable Segments and Geogr61

Reportable Segments and Geographic Information (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 558,301	$ 373,762	$ 863,895	$ 604,680
Long-lived assets	602,409		602,409		$ 574,584
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	512,553	335,681	781,228	536,606
Long-lived assets	582,983		582,983		553,987
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	45,748	$ 38,081	82,667	$ 68,074
Long-lived assets	$ 19,426		$ 19,426		$ 20,597

Subsequent Events (Details)

Subsequent Events (Details) - Gulf Opportunity Zone Bonds	Jun. 30, 2016USD ($)
Subsequent Event [Line Items]
Value of notes issued	$ 100,000,000
Aggregate principal amount of tax-exempt bonds	$ 101,315,000