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Summary Of Significant Accounting Policies (Property, Plant And Equipment, At Cost) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost $ 3,618,560 $ 3,439,521
Less accumulated depreciation (2,141,906) (2,101,535)
Property, plant and equipment, net 1,476,654 1,337,986
Land and Land Improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost 102,483 98,197
Buildings [Member]
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost 377,664 350,301
Machinery And Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost 3,045,145 2,753,258
Construction In Progress [Member]
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost 66,098 212,931
Other [Member]
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost $ 27,170 $ 24,834