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Segment Information (Schedule Of Cash And Cash Equivalents By Geographic Area) (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2013
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Dec. 31, 2012
|
Jun. 30, 2012
|
Dec. 31, 2011
|
|---|---|---|---|---|
| Segment Reporting Information [Line Items] | ||||
| Cash and cash equivalents | $ 349,255 | $ 155,859 | $ 158,501 | $ 179,120 |
|
United States [Member]
|
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| Segment Reporting Information [Line Items] | ||||
| Cash and cash equivalents | 328,089 | 132,890 | ||
|
Germany [Member]
|
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| Segment Reporting Information [Line Items] | ||||
| Cash and cash equivalents | 5,086 | 5,846 | ||
|
Other Europe [Member]
|
||||
| Segment Reporting Information [Line Items] | ||||
| Cash and cash equivalents | 9,379 | 10,247 | ||
|
Asia Pacific [Member]
|
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| Segment Reporting Information [Line Items] | ||||
| Cash and cash equivalents | $ 6,701 | $ 6,876 |