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Commitment and Contingencies - Accrued Environmental Remediation Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Environmental liabilities |  |
Other Commitments [Line Items] |  |
Accrued environmental remediation liabilities | $ 70,109 | $ 72,003
Asset retirement obligations |  |
Other Commitments [Line Items] |  |
Accrued environmental remediation liabilities | $ 2,757 | $ 4,634

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