Property Plant and Equipment (Schedule of Property Plant and Equipment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 158,376	$ 146,454
Less: Accumulated depreciation	(96,472)	(89,653)
Property, Plant and Equipment, Net	61,904	56,801
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	8,708	8,576
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	62,169	59,309
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	65,451	57,320
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	6,705	5,984
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	10,557	10,602
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	$ 4,786	$ 4,663
Useful Lives	3 years