Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Net revenue	$ 126,516us-gaap_SalesRevenueNet	$ 177,235us-gaap_SalesRevenueNet
Operating expenses:
Cost of revenue	33,737us-gaap_CostOfGoodsAndServicesSold	66,867us-gaap_CostOfGoodsAndServicesSold
Research and development	23,949us-gaap_ResearchAndDevelopmentExpense	31,096us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative	80,534	64,521
Total operating expenses	138,220us-gaap_CostsAndExpenses	162,484us-gaap_CostsAndExpenses
(Loss) income from operations	(11,704)us-gaap_OperatingIncomeLoss	14,751us-gaap_OperatingIncomeLoss
Co-promotion and license income	8,388mdco_CoPromotionIncome	6,020mdco_CoPromotionIncome
Gain on remeasurement of equity investment	22,741	0
Loss in equity investment	(144)	0
Interest expense	(8,607)us-gaap_InterestExpense	(3,860)us-gaap_InterestExpense
Other income	109us-gaap_OtherNonoperatingIncomeExpense	179us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	10,783	17,090
Provision for income taxes	(5,777)us-gaap_IncomeTaxExpenseBenefit	(22,095)us-gaap_IncomeTaxExpenseBenefit
Income (loss)	5,006us-gaap_ProfitLoss	(5,005)us-gaap_ProfitLoss
Net loss attributable to non-controlling interest	28	9
Net income (loss) attributable to The Medicines Company	$ 5,034us-gaap_NetIncomeLoss	$ (4,996)us-gaap_NetIncomeLoss
Basic (loss) income per common share attributable to The Medicines Company (USD per share)	$ 0.08us-gaap_EarningsPerShareBasic	$ (0.08)us-gaap_EarningsPerShareBasic
Diluted (loss) income per common share attributable to The Medicines Company (USD per share)	$ 0.08us-gaap_EarningsPerShareDiluted	$ (0.08)us-gaap_EarningsPerShareDiluted
Weighted average number of common shares outstanding:
Basic (shares)	65,174	64,152
Diluted (shares)	66,929	64,152

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