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Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other income (expense) | $ (16,290) | $ (4,640) | $ (17,030) | $ (29,525)
Income tax benefit (expense) | 274,774 | 186,105 | 721,709 | 410,753
Product, net | 2,117,366 | 1,453,554 | 5,916,423 | 3,935,251
Net income attributable to Biogen Idec Inc. | 856,858 | 487,616 | 2,051,320 | 1,405,035
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income attributable to Biogen Idec Inc. | 2,700 | (7,200) | (800) | (3,500)
Accumulated Net Unrealized Investment Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other income (expense) | (100) | 200 | 10,100 | 4,500
Income tax benefit (expense) | 0 | (100) | (3,600) | (1,600)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax benefit (expense) | (100) | 0 | (200) | (300)
Product, net | $ 2,900 | $ (7,300) | $ (7,100) | $ (6,100)

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