Fair Value Measurements (Quantitative Information for Level 3 Transfers) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Contingent purchase price	105,807	18,971
Targanta [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Contingent purchase price	14,307	18,971
Targanta [Member] | Adjusted Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability of success	31.00%	49.00%
Discount rate	11.00%	11.00%
Targanta [Member] | Adjusted Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability of success	20.00%	20.00%
Targanta [Member] | Adjusted Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability of success	38.00%	60.00%
Incline Therapeutics, Inc. [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Contingent purchase price	91,500
Incline Therapeutics, Inc. [Member] | Adjusted Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability of success	75.00%
Discount rate	22.00%
Incline Therapeutics, Inc. [Member] | Adjusted Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability of success	60.00%
Incline Therapeutics, Inc. [Member] | Adjusted Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability of success	80.00%