Additional Balance Sheet and Cash Flow Information (Property, Plant And Equipment, At Cost) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 3,236,361	$ 3,285,322
Accumulated depreciation	(2,332,229)	(2,317,541)
Total property, plant and equipment, net	904,132	967,781
Land and related improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	73,025	70,256
Buildings and related improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	483,965	464,454
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,740,405	1,890,126
Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	733,180	660,090
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 205,786	$ 200,396