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Inventories (Schedule of Inventories) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Inventories:          
Raw materials and supplies $ 92,735   $ 92,735   $ 109,084
Work in process 140,649   140,649   186,473
Finished goods 33,075   33,075   34,589
Total 266,459   266,459   330,146
Lower of cost or market inventory valuation adjustment 7,843 $ 0 11,916 $ 0 12,400
Inventory Valuation Reserves $ 10,100   $ 10,100   $ 12,400