v3.20.4

Summary of Significant Accounting Policies - Reclassifications (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Reclassification from inventories	$ (42,349)		$ (48,296)
Reclassification to other long-term assets	$ 16,819		$ 20,067
Reclassification Adjustment | Catalyst Inventory
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Reclassification from inventories		$ 5,600
Reclassification to other long-term assets		$ 5,600

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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