Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Building Improvements [Member] years	Dec. 31, 2011 Machinery And Equipment [Member] years	Dec. 31, 2011 Computer Equipment And Software [Member] years
Property, Plant and Equipment [Line Items]
Land	$ 4,024	$ 4,924
Buildings and improvements	9,422	8,270
Machinery and equipment	93,894	86,830
Computer equipment and software	72,324	59,609
Total property, plant and equipment, at cost	179,664	159,633
Less: accumulated depreciation	(132,578)	(123,313)
Total property, plant and equipment, net	$ 47,086	$ 36,320
Estimated useful life of asset, Minimum, Years			21	2	3
Estimated useful life of asset, Maximum, Years			30	10	5