Summary of Significant Accounting Policies (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	$ 406,510	$ 477,741
Biomass-based diesel government incentives	68,159	468
Total revenues	474,669	478,209
Biomass-based Diesel
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	387,742	395,383
Biomass-based diesel government incentives	68,159	468
Total revenues	455,901	395,851
Services
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	19,533	19,583
Biomass-based diesel government incentives	0	0
Total revenues	19,533	19,583
Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	44,336	83,903
Biomass-based diesel government incentives	0	0
Total revenues	44,336	83,903
Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	(45,101)	(21,128)
Biomass-based diesel government incentives	0	0
Total revenues	(45,101)	(21,128)
Biomass-based Diesel
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	280,872	314,112
Biomass-based Diesel | Biomass-based Diesel
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	306,552	315,729
BTC related amount due to customers	0	0
Biomass-based Diesel | Services
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Biomass-based Diesel | Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Biomass-based Diesel | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	(25,680)	(1,617)
Petroleum diesel sales
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	44,336	83,903
Petroleum diesel sales | Biomass-based Diesel
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Petroleum diesel sales | Services
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Petroleum diesel sales | Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	44,336	83,903
Petroleum diesel sales | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
LCFS credit sales
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	34,034	36,707
LCFS credit sales | Biomass-based Diesel
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	34,034	36,707
LCFS credit sales | Services
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
LCFS credit sales | Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
LCFS credit sales | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Separated RIN sales
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	15,520	22,463
Separated RIN sales | Biomass-based Diesel
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	15,520	22,463
Separated RIN sales | Services
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Separated RIN sales | Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Separated RIN sales | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Co-product sales
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	12,044	8,403
Co-product sales | Biomass-based Diesel
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	12,044	8,403
Co-product sales | Services
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Co-product sales | Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Co-product sales | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Raw material sales
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	10,954	4,103
Raw material sales | Biomass-based Diesel
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	10,954	4,103
Raw material sales | Services
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Raw material sales | Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Raw material sales | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Other biomass-based diesel revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	8,638	7,978
Other biomass-based diesel revenue | Biomass-based Diesel
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	8,638	7,978
Other biomass-based diesel revenue | Services
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Other biomass-based diesel revenue | Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Other biomass-based diesel revenue | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Other revenues
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	112	72
Other revenues | Biomass-based Diesel
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Other revenues | Services
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	19,533	19,583
Other revenues | Corporate and other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0
Other revenues | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	$ (19,421)	$ (19,511)