Segment Information (Schedule Of Cash And Cash Equivalents By Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 306,316	$ 155,859	$ 179,120	$ 37,349
United States [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents	286,377	132,890
Germany [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents	3,441	5,846
Other Europe [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents	8,915	10,247
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 7,583	$ 6,876