Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 863,197	$ 602,562
Marketable securities	709,869	620,167
Accounts receivable, net	1,002,328	824,406
Due from unconsolidated joint business, net	286,897	252,662
Inventory	715,935	659,003
Other current assets	346,787	226,134
Total current assets	3,925,013	3,184,934
Marketable securities	1,010,837	625,772
Property, plant and equipment, net	1,756,164	1,750,710
Intangible assets, net	4,249,378	4,474,653
Goodwill	1,364,815	1,232,916
Investments and other assets	611,791	594,350
Total assets	12,917,998	11,863,335
Current liabilities:
Current portion of notes payable and line of credit	3,386	3,494
Taxes payable	192,758	179,685
Accounts payable	224,931	219,913
Accrued expenses and other	1,495,549	1,355,187
Total current liabilities	1,916,624	1,758,279
Notes payable	586,091	592,433
Long-term deferred tax liability	139,092	232,554
Other long-term liabilities	710,965	659,231
Total liabilities	3,352,772	3,242,497
Commitments and contingencies
Biogen Idec Inc. shareholders' equity
Preferred stock, par value $0.001 per share	0	0
Common stock, par value $0.0005 per share	128	128
Additional paid-in capital	4,106,084	4,023,651
Accumulated other comprehensive loss	(26,678)	(27,745)
Retained earnings	7,543,597	6,349,135
Treasury stock, at cost	(2,061,832)	(1,724,927)
Total Biogen Idec Inc. shareholders’ equity	9,561,299	8,620,242
Noncontrolling interests	3,927	596
Total equity	9,565,226	8,620,838
Total liabilities and equity	$ 12,917,998	$ 11,863,335