Goodwill and Other Intangible Assets, Net - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Indefinite-lived Intangible Assets
Impairment		$ (10,748)	$ (83,349)
Finite-Lived Intangible Assets
Accumulated Amortization	$ (244,900)	(233,815)	(244,900)	$ (217,603)
Reclassifications		0		0
Gross amount		502,666		778,581
Impairment		(15,550)		(276,002)
Net Balance		253,301		284,976
IPR&D
Indefinite-lived Intangible Assets
Gross amount		4,400		149,161
Reclassifications		0		(5,300)
Impairment	$ (61,600)	0	$ (79,500)	(139,461)
Net Balance		4,400		4,400
Product licensing rights
Finite-Lived Intangible Assets
Gross amount		472,041		597,960
Accumulated Amortization		(218,600)		(203,323)
Reclassifications		0		5,300
Impairment		(15,550)		(131,306)
Net Balance		$ 237,891		$ 268,631
Wtd Avg Remaining Amortization Period (years)		8 years 10 months 24 days		9 years 2 months 12 days
Trademarks
Finite-Lived Intangible Assets
Gross amount		$ 16,000		$ 16,000
Accumulated Amortization		(6,767)		(6,304)
Reclassifications		0		0
Impairment		0		0
Net Balance		$ 9,233		$ 9,696
Wtd Avg Remaining Amortization Period (years)		17 years 4 months 24 days		17 years 6 months
Customer relationships
Finite-Lived Intangible Assets
Gross amount		$ 4,225		$ 4,225
Accumulated Amortization		(2,448)		(2,318)
Reclassifications		0		0
Impairment		0		0
Net Balance		$ 1,777		$ 1,907
Wtd Avg Remaining Amortization Period (years)		7 years 1 month 6 days		7 years 3 months 18 days
Other intangibles
Finite-Lived Intangible Assets
Gross amount		$ 6,000		$ 11,235
Accumulated Amortization		(6,000)		(5,658)
Reclassifications		0		0
Impairment		0		(5,235)
Net Balance		$ 0		$ 342
Wtd Avg Remaining Amortization Period (years)		0 years		3 months 18 days