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Investments in Privately-Held Raw Material Companies - Minority Investment Entities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) entity	Mar. 31, 2020 USD ($)
Minority investment entities
Impaired entities | entity	1
Five Minority Investments
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract]
Net revenue	$ 8,525	$ 3,953
Gross profit	3,807	2,020
Operating (loss)	3,061	197
Net income (loss)	2,612	2
Minority investment entities
Entity portion of loss from unconsolidated equity method investments, including impairment charges	$ 1,100	$ 100

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