Revenue from Contracts with Customers - Transaction Price and Variable Consideration (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Rebates and Incentives
Allowance categories
Balance at beginning of the period	$ 129,901	$ 129,318
Provision related to current period sales	83,573	65,881
Changes in estimate related to prior period sales	1,131	(3,017)
Credits/payments made	(73,075)	(59,295)
Balance at end of the period	141,530	132,887
Product Returns
Allowance categories
Balance at beginning of the period	27,648	15,465
Provision related to current period sales	3,406	4,992
Credits/payments made	(698)	(1,016)
Balance at end of the period	30,356	19,441
Trade Allowances and Chargebacks
Allowance categories
Balance at beginning of the period	14,020	14,841
Provision related to current period sales	18,770	15,658
Changes in estimate related to prior period sales	49
Credits/payments made	(18,625)	(15,728)
Balance at end of the period	$ 14,214	$ 14,771