Segment Information (Schedule Of Geographic Information On Long-Lived Assets, Based On Country Of Origin) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 192,882	$ 210,669	$ 158,118
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	124,035	139,161	92,312
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	9,425	10,570	13,110
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 59,422	$ 60,938	$ 52,696