Commitments and Contingencies (Details) $ in Thousands	Dec. 31, 2020 USD ($)
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

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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