Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 349,270	$ 334,368
Accumulated depreciation	(173,209)	(156,524)
Property, plant and equipment, net	176,061	177,844
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	7,847	7,543
Buildings [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	50,974	50,607
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	281,008	269,034
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 9,441	$ 7,184