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Intangible Assets Intangible Asset Narrative (Details) (Core Developed Technology [Member])
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3 Months Ended |
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Mar. 31, 2013
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Core Developed Technology [Member]
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| Acquired Finite-Lived Intangible Assets [Line Items] | |
| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 7 years |