Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 602,562	$ 570,721
Marketable securities	620,167	1,134,989
Accounts receivable, net	824,406	686,848
Due from unconsolidated joint business, net	252,662	268,395
Inventory	659,003	447,373
Other current assets	226,134	136,011
Total current assets	3,184,934	3,244,337
Marketable securities	625,772	2,036,658
Property, plant and equipment, net	1,750,710	1,742,226
Intangible assets, net	4,474,653	1,631,547
Goodwill	1,232,916	1,201,296
Investments and other assets	594,350	274,054
Total assets	11,863,335	10,130,118
Current liabilities:
Current portion of notes payable and line of credit	3,494	453,379
Taxes payable	179,685	20,066
Accounts payable	219,913	203,999
Accrued expenses and other	1,355,187	979,945
Total current liabilities	1,758,279	1,657,389
Notes payable and other financing arrangements	592,433	687,396
Long-term deferred tax liability	232,554	217,272
Other long-term liabilities	659,231	604,266
Total liabilities	3,242,497	3,166,323
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	127
Additional paid-in capital	4,023,651	3,854,525
Accumulated other comprehensive loss	(27,745)	(55,305)
Retained earnings	6,349,135	4,486,794
Treasury stock, at cost; 19,641 shares and 17,655 shares, respectively	(1,724,927)	(1,324,618)
Total Biogen Idec Inc. shareholders’ equity	8,620,242	6,961,523
Noncontrolling interests	596	2,272
Total equity	8,620,838	6,963,795
Total liabilities and equity	$ 11,863,335	$ 10,130,118