Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Inventories:
Raw materials and supplies	$ 147,530	$ 216,761
Work in process	188,620	192,821
Finished goods	42,820	38,159
Total	$ 378,970	$ 447,741