Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Payables and Accruals [Abstract]
Accrued alternative fuels incentives	$ 21,934	$ 28,106
Accrued employee benefits	4,218	4,547
Accrued gas and equipment purchases	19,060	17,158
Accrued interest	1,478	893
Accrued property and other taxes	4,031	3,369
Accrued salaries and wages	4,463	8,172
Embedded derivatives	5	0
Other	14,150	12,914
Total accrued liabilities	$ 69,339	$ 75,159