Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands, shares in Millions	1 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2017	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	May 31, 2017
Summary Of Significant Accounting Policies [Line Items]
Contract with customer, payment terms, period		90 days
Noncurrent restricted cash			$ 900	$ 1,800
Chargeback period, extended period			84 days
Chargebacks			$ 830,038	$ 953,326	$ 1,218,560
Sales chargebacks as a percentage of gross sales			44.00%	40.50%
Gross sales			$ 1,887,862	$ 2,351,071	2,891,267
Change in ratio of direct to indirect sales for chargeback reserves used in sensitivity analysis			1.40%
Potential increase in chargeback expense based on sensitivity analysis			$ 200
Potential decrease in chargeback expense based on sensitivity analysis			600
Rebates, administrative fees and others			$ 297,802	$ 476,601	463,724
Rebates, administrative and other fees as a percentage of gross sales			15.80%	20.30%
Change in ratio of direct to indirect sales for rebates, administrative and other fees used in sensitivity analysis			1.40%
Potential increase in rebates, administrative and other fees expense based on sensitivity analysis			$ 0
Potential decrease in rebates, administrative and other fees expense based on sensitivity analysis			100
Product returns			$ 20,162	$ 26,874	28,285
Sales returns as a percentage of gross sales			1.10%	1.10%
Change in lag time to process returns for sales returns reserve used in sensitivity analysis			8 months 12 days
Potential increase in sales returns expense based on sensitivity analysis			$ 1,000
Potential decrease in sales returns expense based on sensitivity analysis			900
Past due gross accounts receivable			33,400
Past due gross accounts receivable, aged over 60 days			5,900
Provision for Inventory obsolescence			27,341	$ 21,369	32,100
Allowance for inventory obsolescence			46,505	34,402	33,532
Research and development reserve			4,000	1,500
Depreciation			$ 29,300	$ 23,700	$ 22,200
Shares excluded from the computation of diluted net earnings per share (in Shares)			3.7	3.2	3.6
Available-for-sale securities			$ 18	$ 35
Nicox
Summary Of Significant Accounting Policies [Line Items]
Cost basis			$ 100
Available-for-sale securities						$ 3,000
Proceeds from disposal of assets	$ 2,600
Gain (loss) realized on sale of securities				$ (400)
Minimum
Summary Of Significant Accounting Policies [Line Items]
Chargeback period			28 days
Useful life			1 year
Maximum
Summary Of Significant Accounting Policies [Line Items]
Chargeback period			42 days
Useful life			30 years