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Segment Information (Schedule Of Cash And Cash Equivalents By Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 306,704	$ 306,316	$ 110,543	$ 155,859
United States [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents	284,108	286,377
Germany [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents	5,534	3,441
Other Europe [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents	8,992	8,915
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 8,070	$ 7,583

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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