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	Dec. 31, 2012 Buildings and improvements Minimum	Dec. 31, 2012 Buildings and improvements Maximum	Dec. 31, 2012 Machinery and equipment Minimum	Dec. 31, 2012 Machinery and equipment Maximum	Dec. 31, 2012 Computer equipment and software Minimum	Dec. 31, 2012 Computer equipment and software Maximum
Property, Plant and Equipment [Line Items]
Land	$ 4,024	$ 4,024
Buildings and Improvements, Gross	9,654	9,422
Machinery and Equipment, Gross	103,064	93,894
Computer Equipment And Software	72,187	72,324
Property, Plant and Equipment, Gross	188,929	179,664
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(144,602)	(132,578)
Property, plant and equipment, net	$ 44,327	$ 47,086
Property, Plant and Equipment, Useful Life			21 years	30 years	2 years	10 years	3 years	5 years