Property, Plant And Equipment (Property, Plant And Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 763,712	$ 718,139
Total accumulated depreciation	(448,382)	(415,467)
Property, plant and equipment, net	315,330	302,672
Land [Member]
Property Plant And Equipment [Line Items]
Total property, plant and equipment	38,283	36,628
Buildings [Member]
Property Plant And Equipment [Line Items]
Total property, plant and equipment	176,306	157,862
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Total property, plant and equipment	472,323	431,189
Construction in Progress [Member]
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 76,800	$ 92,460