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Summary of Significant Accounting Policies - (Details Textual)
1 Months Ended 3 Months Ended 7 Months Ended 12 Months Ended
Jun. 15, 2019
shares
Jun. 02, 2016
USD ($)
Jan. 31, 2020
USD ($)
Jun. 30, 2019
shares
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
renewable_identification_number
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2014
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Current restricted cash         $ 3,000,000       $ 3,000,000       $ 0 $ 3,000,000 $ 3,000,000 $ 0        
Receivable related to the reinstatement of the BTC         858,922,000       74,551,000         858,922,000 74,551,000          
Gain on involuntary conversion                           0 4,457,000 5,329,000        
Capitalization of interest incurred on debt during construction         0       360,000       301,000 0 360,000 301,000        
Impairment of goodwill                           0 0          
Impairment of property, plant and equipment, net         595,000 $ 11,145,000 $ 468,000 $ 0 879,000 $ 0 $ 0 $ 0   12,208,000 879,000 49,873,000        
Impairment charges due to deteriorating physical condition                               5,224,000        
Gain on debt extinguishment                           $ 488,000 6,297,000 0        
Shares covered by rebalancing call options (in shares)                           100.00%            
Termination of capped call options (in shares) | shares       625,558                                
Advertising and promotional expenses                           $ 2,795,000 1,989,000 2,140,000        
Matching contributions                           50.00%            
Participants eligible earnings                           6.00%            
Total expense related to the Company's defined contribution plan                           $ 1,815,000 1,588,000 1,367,000        
Cash, coverage by U.S. FDIC         250,000                 250,000            
Retained earnings         $ (800,792,000)       (427,244,000)         $ (800,792,000) (427,244,000)          
Accounting Standards Update 2016-02                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Retained earnings                                   $ 6,516,000    
December 2017 Program                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Security repurchase program, amount authorized to be repurchased                         75,000,000     75,000,000        
June 2018 Program                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Security repurchase program, amount authorized to be repurchased                     $ 75,000,000                  
January 2019 Program                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Security repurchase program, amount authorized to be repurchased                                 $ 75,000,000      
Convertible Senior Notes | 2019 Convertible Notes                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Face amount                                       $ 143,800,000
Interest rate         2.75%                 2.75%           2.75%
Convertible Notes Repurchases                           $ 0 6,689,000          
Convertible Notes Repurchases, Principal Amount                           0 6,311,000          
Settlement of convertible notes conversion premium (in shares) | shares 1,902,781                                      
Termination of capped call options (in shares) | shares       625,558                                
Convertible Senior Notes | 2019 Convertible Notes | December 2017 Program                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Convertible Notes Repurchases                             6,689,000          
Convertible Senior Notes | 2019 Convertible Notes | June 2018 Program                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Convertible Notes Repurchases                           0 0          
Convertible Senior Notes | 2019 Convertible Notes | January 2019 Program                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Convertible Notes Repurchases                           0            
Convertible Senior Notes | 2036 Convertible Notes                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Face amount   $ 152,000,000                                 $ 152,000,000  
Interest rate   4.00%                                 4.00%  
Convertible Notes Repurchases   $ 147,118,000                       14,638,000 110,828,000          
Convertible Notes Repurchases, Principal Amount                           6,673,000 55,700,000          
Reflecting conversion premium, after tax         $ 9,715,000       $ 70,011,000         9,715,000 70,011,000          
Gain on debt extinguishment                           (488,000) (6,065,000)          
Convertible Senior Notes | 2036 Convertible Notes | December 2017 Program                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Convertible Notes Repurchases                             43,263,000          
Convertible Senior Notes | 2036 Convertible Notes | June 2018 Program                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Convertible Notes Repurchases                           7,435,000 67,565,000          
Convertible Senior Notes | 2036 Convertible Notes | January 2019 Program                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Convertible Notes Repurchases                           7,203,000            
Convertible Senior Notes | 2036 Convertible Notes | Subsequent Event                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Convertible Notes Repurchases     $ 9,402,000                                  
Madison                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Estimated impaired fixed assets                         $ 2,671,000              
Insurance recoveries                           12,454,000            
Proceeds from business interruption insurance                           $ 9,484,000            
Gain on involuntary conversion                             $ 4,454,000          
Services                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Minimum percentage increase in fair value of each of the reporting units over its carrying value through annual impairment test                           5.00%            
REG New Boston                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Impairment of property, plant and equipment, net                           $ 11,145,000            
New Orleans                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Impairment of property, plant and equipment, net                               $ 44,649,000        
Minimum                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
RINs per gallon | renewable_identification_number                           1.5            
Allowed RINs per gallon | renewable_identification_number                           0            
Maximum                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
RINs per gallon | renewable_identification_number                           1.7            
Allowed RINs per gallon | renewable_identification_number                           2.5            
Biodiesel Mixture Excise Tax Credit | United States Federal Goverment [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Receivable related to the reinstatement of the BTC         672,627,000                 $ 672,627,000            
Biodiesel Mixture Excise Tax Credit | Customers [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Receivable related to the reinstatement of the BTC         $ 109,406,000                 $ 109,406,000