Property, Plant and Equipment (Summary Of Property, Plant And Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment, Net [Abstract]
Property, plant and equipment, gross	$ 2,879,065	$ 3,749,470
Accumulated depreciation and depletion	(2,214,116)	(2,640,344)
Property, plant and equipment, net	664,949	1,109,126
Machinery And Equipment [Member]
Property, Plant and Equipment, Net [Abstract]
Property, plant and equipment, gross	2,425,526	3,229,793
Buildings, Improvements And Leasehold Improvements [Member]
Property, Plant and Equipment, Net [Abstract]
Property, plant and equipment, gross	255,719	278,339
Automobiles, trucks, tractors and trailers [Member]
Property, Plant and Equipment, Net [Abstract]
Property, plant and equipment, gross	22,727	26,522
Furniture And Fixtures [Member]
Property, Plant and Equipment, Net [Abstract]
Property, plant and equipment, gross	40,694	52,045
Construction in Progress [Member]
Property, Plant and Equipment, Net [Abstract]
Property, plant and equipment, gross	16,661	38,119
Land [Member]
Property, Plant and Equipment, Net [Abstract]
Property, plant and equipment, gross	48,534	58,047
Oil and Gas Producing Assets [Member]
Property, Plant and Equipment, Net [Abstract]
Property, plant and equipment, gross	$ 69,204	$ 66,605

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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