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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other income (expense) | $ 4,861 | $ (10,428) | $ (740) | $ (24,885)
Income tax benefit (expense) | 268,521 | 159,140 | 446,935 | 224,648
Product, net | 2,056,292 | 1,385,918 | 3,799,057 | 2,481,697
Net income attributable to Biogen Idec Inc. | 714,506 | 490,670 | 1,194,462 | 917,419
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income attributable to Biogen Idec Inc. | 700 | (100) | (3,500) | 3,700
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) | 10,100 | 0 | 10,200 | 4,300
Income tax benefit (expense) | (3,600) | 0 | (3,600) | (1,500)
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) | (500) | (200) | (100) | (300)
Product, net | $ (5,300) | $ 100 | $ (10,000) | $ 1,200

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