Goodwill and Other Intangible Assets, Net - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Indefinite-lived Intangible Assets
Impairment	$ 0	$ (10,354)
Finite-Lived Intangible Assets
Accumulated Amortization	(209,257)	$ (224,000)	$ (203,115)
Reclassifications	0		0
Gross amount	418,916		502,666
Impairment	0		(83,750)
Net Carrying Amount	209,659		215,801
IPR&D
Indefinite-lived Intangible Assets
Gross amount	4,200		4,400
Reclassifications	0		0
Impairment	0		(200)
Net Carrying Amount	4,200		4,200
Product licensing rights
Finite-Lived Intangible Assets
Gross amount	388,491		472,041
Accumulated Amortization	(193,151)		(187,306)
Reclassifications	0		0
Impairment	0		(83,550)
Net Carrying Amount	$ 195,340		$ 201,185
Weighted Average Remaining Amortization Period (years)	9 years 3 months 18 days		9 years 6 months
Trademarks
Finite-Lived Intangible Assets
Gross amount	$ 16,000		$ 16,000
Accumulated Amortization	(7,463)		(7,231)
Reclassifications	0		0
Impairment	0		0
Net Carrying Amount	$ 8,537		$ 8,769
Weighted Average Remaining Amortization Period (years)	17 years 2 months 12 days		17 years 2 months 12 days
Customer relationships
Finite-Lived Intangible Assets
Gross amount	$ 4,225		$ 4,225
Accumulated Amortization	(2,643)		(2,578)
Reclassifications	0		0
Impairment	0		0
Net Carrying Amount	$ 1,582		$ 1,647
Weighted Average Remaining Amortization Period (years)	6 years 1 month 6 days		6 years 3 months 18 days
Other intangibles
Finite-Lived Intangible Assets
Gross amount	$ 6,000		$ 6,000
Accumulated Amortization	(6,000)		(6,000)
Reclassifications	0		0
Impairment	0		0
Net Carrying Amount	$ 0		$ 0
Weighted Average Remaining Amortization Period (years)	0 years		0 years