Commitments and Contingencies (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Environmental Matters
Accrued environmental liabilities	$ 12,126
Accrued environmental liabilities, current	6,346
Accrued environmental liabilities, noncurrent	5,780
Estimated purchase commitments [Abstract]
2020	38,945
2021	17,383
2022	1,560
2023	$ 1,560

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

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