Revenues from Contracts with Customers and Other Revenue - Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenues from Contracts with Customers and Other Revenue
Total operating revenues	$ 3,990	$ 4,060
Renewable natural gas
Revenues from Contracts with Customers and Other Revenue
Total operating revenues	219	130
Environmental attributes
Revenues from Contracts with Customers and Other Revenue
Total operating revenues	3,771	3,533
Other hydrocarbon revenue - ethanol, isooctane, IBA
Revenues from Contracts with Customers and Other Revenue
Total operating revenues	$ 0	$ 397