Segment Information (Schedule Of Intercompany Sales By Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Intercompany Sales	$ 17,671	$ 11,542
United States [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	10,511	7,884
Germany [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	1,677	274
Other Europe [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	4,323	3,384
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	1,160
Intercompany Sales To United States [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	4,774	3,390
Intercompany Sales To United States [Member] | Germany [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	318	114
Intercompany Sales To United States [Member] | Other Europe [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	3,931	3,276
Intercompany Sales To United States [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	525
Intercompany Sales To Germany [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	6,446	3,926
Intercompany Sales To Germany [Member] | United States [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	5,783	3,902
Intercompany Sales To Germany [Member] | Other Europe [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	283	24
Intercompany Sales To Germany [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	380
Intercompany Sales To Other Europe [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	5,041	3,349
Intercompany Sales To Other Europe [Member] | United States [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	3,604	3,105
Intercompany Sales To Other Europe [Member] | Germany [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	1,359	160
Intercompany Sales To Other Europe [Member] | Other Europe [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	78	84
Intercompany Sales To Asia Pacific [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	1,410	877
Intercompany Sales To Asia Pacific [Member] | United States [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	1,124	877
Intercompany Sales To Asia Pacific [Member] | Other Europe [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	31
Intercompany Sales To Asia Pacific [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Intercompany Sales	$ 255