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Investments in Privately-Held Raw Material Companies - Minority Investment Entities (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract]        
Net revenue $ 18,595,000 $ 39,487,000 $ 38,000,000 $ 79,140,000
Gross profit 1,715,000 15,435,000 6,825,000 28,743,000
Net income (5,353,000) 6,545,000 (9,019,000) 10,517,000
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 7,678,000 14,099,000 15,652,000 24,833,000
Gross profit 2,648,000 8,827,000 5,554,000 14,827,000
Operating income 3,163,000 9,119,000 5,172,000 13,268,000
Net income 913,000 7,253,000 4,858,000 10,951,000
Minority investment entities        
Entity income (loss) excluding impairment $ (18,000) $ 2,200,000 $ 1,000,000.0 $ 3,300,000