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Investments in Privately-Held Raw Material Companies - Minority Investment Entities (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
entity
Sep. 30, 2021
USD ($)
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract]        
Revenue $ 35,183 $ 34,576 $ 114,323 $ 99,661
Gross profit 14,782 11,501 43,525 35,275
Net income 6,730 4,496 $ 17,247 12,876
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]        
Revenue 13,658 8,993 $ 38,491 27,782
Gross profit 8,687 4,506 23,412 13,850
Operating income 8,039 3,751 21,308 11,504
Net income 6,088 3,127 17,039 10,230
Minority investment entities        
Entity income (loss) excluding impairment $ 2,000 $ 1,100 $ 5,300 $ 3,700