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Segment Information (Schedule Of Income Or Loss From Operations By Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Income (loss) from operations	$ 17,976	$ 28,570	$ 16,796	$ 17,519	$ 18,166	$ 18,436	$ 13,999	$ 9,970	$ 80,861	$ 60,571	$ 34,902
Subtotal [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations									82,393	60,991	34,351
Inter-Segment Elimination [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations									(1,532)	(420)	551
United States [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations									43,743	37,743	19,045
Germany [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations									302	1,305	1,509
Other Europe [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations									7,849	5,415	6,645
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations									$ 30,499	$ 16,528	$ 7,152

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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