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Property And Equipment (Schedule Of Components Of Property And Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 1,331,884	$ 1,313,948
Less: accumulated depreciation and amortization	(530,194)	(486,677)
Property and equipment, net	801,690	827,271
Plant Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	940,363	911,097
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	170,813	168,309
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	86,909	92,321
Railroad Track and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	34,637	34,404
Construction-in-Progress [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	48,378	60,262
Computer Hardware And Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	20,477	19,368
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	3,797	3,716
Leasehold Improvements And Other [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 26,510	$ 24,471

X

- Definition

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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