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Accrued Liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Payables and Accruals [Abstract] |  |
Accrued alternative fuels incentives | $ 27,472 | $ 42,565
Accrued employee benefits | 4,622 | 5,271
Accrued gas and equipment purchases | 18,702 | 17,764
Accrued interest | 1,455 | 1,451
Accrued property and other taxes | 6,798 | 5,628
Accrued salaries and wages | 11,123 | 11,902
Asset retirement obligation (current portion) | 13,893 | 7,047
Other | 15,342 | 13,935
Total accrued liabilities | $ 99,407 | $ 105,563
Concentration risk percentage | 5.00% | 5.00%

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for purchases of natural gas and equipment. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References No definition available. + Details
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