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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, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
entity
Sep. 30, 2020
USD ($)
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract]            
Revenue $ 34,576 $ 25,469     $ 99,661 $ 68,326
Gross profit 11,501 8,823     35,275 21,113
Net income (loss) 4,496 1,481 $ 959 $ 217 $ 12,876 2,657
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 8,993 5,052     $ 27,782 12,610
Gross profit 4,506 918     13,850 2,944
Operating income 3,751 136     11,504 598
Net income (loss) 3,127 7     10,230 (151)
Minority investment entities            
Entity portion of loss from unconsolidated equity method investments, including impairment charges $ 1,100 $ 45,000     $ 3,700 $ (200)