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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