Fair Value Measurements - Level 3 Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Contingent consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance, liabilities	$ 20,056	$ 18,002
Additions, liabilities	47,710	1,234
Total losses (gains) for the period:
Included in results of operations, liabilities	4,204	820
Payments/conversions, liabilities	(2,761)
Ending Balance, liabilities	69,209	20,056
Deferred acquisition payments, net of discount [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance, liabilities	10,103	0
Additions, liabilities		9,673
Total losses (gains) for the period:
Included in results of operations, liabilities	597	430
Payments/conversions, liabilities	(5,365)
Ending Balance, liabilities	5,335	10,103
Embedded conversion option [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance, liabilities	0
Additions, liabilities	59,204
Total losses (gains) for the period:
Included in results of operations, liabilities	41,818
Payments/conversions, liabilities	(1,199)
Ending Balance, liabilities	99,823
BZNE Note and conversion feature [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance, assets		0
Additions, assets		1,700
Total losses (gains) for the period:
Included in results of operations, assets		1,563
Included in Other comprehensive loss, assets		53
Transfer out to equity method investment, assets		1,276
Ending Balance, assets	$ 2,040	$ 2,040