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Property, Plant and Equipment - (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, plant and equipment                      
Property, Plant and Equipment $ 760,392       $ 754,558       $ 760,392 $ 754,558  
Accumulated depreciation (238,427)       (205,537)       (238,427) (205,537)  
Property plant and equipment net excluding construction in progress 521,965       549,021       521,965 549,021  
Construction in process 62,612       41,702       62,612 41,702  
Total 584,577       590,723       584,577 590,723  
Impairment of property, plant and equipment 595 $ 11,145 $ 468 $ 0 879 $ 0 $ 0 $ 0 12,208 879 $ 49,873
REG New Boston                      
Property, plant and equipment                      
Impairment of property, plant and equipment                 11,145    
Land                      
Property, plant and equipment                      
Property, Plant and Equipment 10,037       10,649       10,037 10,649  
Buildings and improvements                      
Property, plant and equipment                      
Property, Plant and Equipment 152,336       148,055       152,336 148,055  
Leasehold improvements                      
Property, plant and equipment                      
Property, Plant and Equipment 11,692       11,364       11,692 11,364  
Machinery and equipment                      
Property, plant and equipment                      
Property, Plant and Equipment $ 586,327       $ 584,490       $ 586,327 $ 584,490