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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income attributable to Biogen Inc. | $ 927,276 | $ 714,506 | $ 1,749,817 | $ 1,194,462
Other comprehensive income: |  |  |  |
Unrealized gains (losses) on securities available for sale, net of tax of $(145) and $(4,029) for the three months ended June 30, 2015 and 2014, respectively; and $621 and $(3,015) for the six months ended June 30, 2015 and 2014, respectively | (214) | (6,865) | 1,085 | (5,140)
Unrealized gains (losses) on foreign currency forward contracts, net of tax of $(454) and $(260) for the three months ended June 30, 2015 and 2014, respectively; and $(42) and $5 for the six months ended June 30, 2015 and 2014, respectively | (96,159) | 10,760 | (8,913) | 16,551
Unrealized gains (losses) on pension benefit obligation | 2,851 | (170) | 4,109 | 646
Currency translation adjustment | 63,035 | (8,047) | (37,818) | (10,991)
Total other comprehensive income (loss), net of tax | (30,487) | (4,322) | (41,537) | 1,066
Comprehensive income attributable to Biogen Inc. | 896,789 | 710,184 | 1,708,280 | 1,195,528
Comprehensive income (loss) attributable to noncontrolling interests, net of tax | (2,266) | 8,626 | (4,533) | 8,398
Comprehensive income | $ 894,523 | $ 718,810 | $ 1,703,747 | $ 1,203,926

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