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]
Right-of-use finance lease assets	$ 506
Property, plant and equipment, gross		$ 137,005
Property, plant, equipment and finance lease right of use asset, gross	146,201
Less: Accumulated depreciation		(61,839)
Less: Accumulated depreciation	(75,925)
Property, plant and equipment, net	70,276
Property, plant and equipment, net	70,276	75,166
Land and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,407	5,457
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	27,600	26,254
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	108,474	101,492
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,214	$ 3,802