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v3.20.4

Commitments and Contingencies (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Environmental Matters |
Accrued environmental liabilities | $ 11,710
Accrued environmental liabilities, current | 4,929
Accrued environmental liabilities, noncurrent | 6,781
Estimated purchase commitments [Abstract] |
2021 | 30,461
2022 | 16,011
2023 | $ 1,560

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