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Supplementary Balance Sheet Detail (Schedule Of Amounts Recognized In Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]
Raw materials and supplies	$ 78,386	$ 109,084
Work in process	122,590	186,473
Finished goods	30,265	34,589
Inventories	231,241	330,146
Prepaid expenses	11,258	11,176
Value-added tax and other indirect taxes receivable	21,922	28,629
Spare parts inventory	14,189	15,242
Other current assets	8,363	11,335
Prepaid Expense and Other Assets, Current	55,732	66,382
Land and improvements	49,212	49,962
Buildings	85,871	87,820
Machinery and equipment and other	731,783	717,002
Construction in progress	43,381	65,660
Property, plant and equipment	910,247	920,444
Payrolls (including incentive programs)	9,979	22,369
Employee benefits	6,074	7,018
Deferred Revenue	11,223	31,583
Other	28,156	30,732
Accrued liabilities, net	55,432	91,702
Post-employment benefits	10,969	12,613
Pension and related benefits	21,919	26,068
Other	15,671	16,964
Other long - term obligations	$ 48,559	$ 55,645

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