Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Property Plant And Equipment [Line Items]
Total property and equipment, at cost	$ 739,652	$ 734,041
Less: Accumulated depreciation	(514,555)	(506,343)
Total property, plant and equipment, net	225,097	227,698
Land [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, at cost	5,867	5,867
Buildings And Building Improvements [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, at cost	92,371	81,282
Machinery And Equipment [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, at cost	547,658	553,468
Furniture And Fixtures [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, at cost	13,812	12,897
Vehicles [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, at cost	947	1,115
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, at cost	68,817	54,754
Construction In Progress[Member]
Property Plant And Equipment [Line Items]
Total property and equipment, at cost	$ 10,180	$ 24,658