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Property, Plant, and Equipment, at Cost (Schedule Of Property, Plant, And Equipment, At Cost) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment, at Cost [Line Items]
Property, Plant and Equipment, Gross	$ 1,543,452	$ 1,465,932
Less accumulated depreciation and amortization	878,305	830,493
Property, plant, and equipment, net	665,147	635,439
Construction in Progress [Member]
Property, Plant and Equipment, at Cost [Line Items]
Property, Plant and Equipment, Gross	73,234	29,228
Land [Member]
Property, Plant and Equipment, at Cost [Line Items]
Property, Plant and Equipment, Gross	37,796	40,938
Land Improvements
Property, Plant and Equipment, at Cost [Line Items]
Property, Plant and Equipment, Gross	58,646	57,635
Leasehold Improvements [Member]
Property, Plant and Equipment, at Cost [Line Items]
Property, Plant and Equipment, Gross	2,146	2,122
Buildings
Property, Plant and Equipment, at Cost [Line Items]
Property, Plant and Equipment, Gross	183,234	174,600
Machinery and Equipment
Property, Plant and Equipment, at Cost [Line Items]
Property, Plant and Equipment, Gross	$ 1,188,396	$ 1,161,409

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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