Segment Information (Schedule Of Intercompany Sales By Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Intercompany Sales	$ 14,103	$ 11,521	$ 24,176	$ 32,299
United States [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	9,444	6,919	15,813	20,299
Germany [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	598	1,071	1,338	2,584
Other Europe [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	3,934	3,531	6,974	9,416
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	127		51
Intercompany Sales To United States [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	3,935	3,532	6,833	9,514
Intercompany Sales To United States [Member] | Germany [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	94	8	128	118
Intercompany Sales To United States [Member] | Other Europe [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	3,714	3,524	6,661	9,396
Intercompany Sales To United States [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	127		44
Intercompany Sales To Germany [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	5,655	3,968	8,329	11,266
Intercompany Sales To Germany [Member] | United States [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	5,577	3,968	8,270	11,265
Intercompany Sales To Germany [Member] | Other Europe [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	78		52	1
Intercompany Sales To Germany [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Intercompany Sales			7
Intercompany Sales To Other Europe [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	3,682	3,340	7,176	8,707
Intercompany Sales To Other Europe [Member] | United States [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	3,065	2,270	6,004	6,222
Intercompany Sales To Other Europe [Member] | Germany [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	504	1,063	1,033	2,466
Intercompany Sales To Other Europe [Member] | Other Europe [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	113	7	139	19
Intercompany Sales To Asia Pacific [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	831	681	1,838	2,812
Intercompany Sales To Asia Pacific [Member] | United States [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	802	681	1,539	2,812
Intercompany Sales To Asia Pacific [Member] | Germany [Member]
Segment Reporting Information [Line Items]
Intercompany Sales			177
Intercompany Sales To Asia Pacific [Member] | Other Europe [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	$ 29		$ 122