Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 180,041	$ 178,044
Less: Accumulated depreciation	(113,412)	(107,094)
Property, plant and equipment, net	66,629	70,950
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	9,063	9,478
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 75,610	73,828
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives	5 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives	20 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 71,028	70,791
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives	10 years
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 7,165	7,128
Office furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives	3 years
Office furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives	7 years
Computer software
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 11,889	11,298
Computer software | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives	3 years
Computer software | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives	7 years
Transportation equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 5,286	$ 5,521
Useful Lives	3 years