Property Plant and Equipment (Schedule of Property Plant and Equipment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 146,454	$ 148,160
Less: Accumulated depreciation	(89,653)	(86,034)
Property, Plant and Equipment, Net	56,801	62,126
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	8,576	8,897
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	59,309	59,189
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives	10 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	57,320	59,200
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	15 years
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	5,984	5,877
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	10,602	10,368
Computer software | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives	2 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	$ 4,663	$ 4,629
Useful Lives	3 years