Property, Plant and Equipment (Schedule of Plant Property and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 568,533	$ 562,032
Accumulated depreciation	(367,850)	(365,844)
Property, plant and equipment, net	200,683	196,188
Equipment in process	126,284	76,190
Total property, plant and equipment, net	326,967	272,378
Land and improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	24,804	22,589
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	163,920	155,669
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	322,653	324,773
Office equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 57,156	$ 59,001