Segment Information (Schedule Of Income Or Loss From Operations By Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Income (loss) from operations	$ 17,519	$ 9,970
United States [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	11,269	5,456
Germany [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	661	253
Other Europe [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	1,766	1,009
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	4,317	3,155
Subtotal [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	18,013	9,873
Inter-Segment Elimination [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	$ (494)	$ 97