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Segment Information (Revenue Generated From Customers Based Outside Of The U.S.) (Details)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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U.S. [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||
| Revenue generated by external customers in foreign countries, percentage | 88.00% | 90.00% | 92.00% |
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Canada [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||
| Revenue generated by external customers in foreign countries, percentage | 10.00% | 5.00% | 6.00% |
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Others [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||
| Revenue generated by external customers in foreign countries, percentage | 2.00% | 5.00% | 2.00% |