Annual report pursuant to Section 13 and 15(d)

Cover Page

Cover Page - USD ($)
12 Months Ended
Dec. 31, 2019
Feb. 29, 2020
Jun. 30, 2019
Cover [Abstract]      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-35397    
Entity Registrant Name RENEWABLE ENERGY GROUP, INC.    
Entity Central Index Key 0001463258    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag true    
Amendment Description As described in the Current Report on Form 8-K with the Securities and Exchange Commission (the “SEC”) by Renewable Energy Group, Inc. (“REG” or the “Company”), the Board of Directors (the “Board”) of the Company, upon the recommendation of the Audit Committee of the Board, determined that, as a result of certain errors, the Company will restate the Company’s previously issued financial statements for each of the years ended December 31, 2019 and 2018 included in the Company’s Annual Report on Form 10-K filed with the SEC on March 6, 2020 (the “Original Form 10-K”), and each of the quarterly periods ended March 31, June 30 and September 30, 2019 and 2018 included in the Company’s Quarterly Reports on Form 10-Q for such periods. The Company is filing this Amendment No. 1 on Form 10-K to restate and amend the Original Form 10-K.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 26-4785427    
Entity Address, Address Line One 416 South Bell Avenue    
Entity Address, City or Town Ames    
Entity Address, State or Province IA    
Entity Address, Postal Zip Code 50010    
City Area Code 515    
Local Phone Number 239-8000    
Title of 12(b) Security Common Stock, par value $.0001 per share    
Trading Symbol REGI    
Security Exchange Name NASDAQ    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   38,967,079  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Public Float     $ 515,008,220
Documents Incorporated by Reference All or a portion of Items 10 through 14 in Part III of this Form 10-K are incorporated by reference to the Registrant’s definitive proxy statement on Schedule 14A, which will be filed within 120 days after the close of the fiscal year covered by this report on Form 10-K, or if the Registrant’s Schedule 14A is not filed within such period, will be included in an amendment to this Report on Form 10-K which will be filed within such 120 day period.