Summary of Significant Accounting Policies (Details) - Chargebacks, Rebates, Administrative Fees and Other, and Sales Returns - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Chargebacks	$ 1,218,560	$ 1,065,244	$ 643,004
Sales chargebacks as a percentage of gross sales	42.10%	42.40%
Gross sales	$ 2,891,267	$ 2,511,693	1,433,603
Change in ratio of direct to indirect sales for chargeback reserves used in sensitivity analysis	3.80%
Potential increase in chargeback expense based on sensitivity analysis	$ 1,400
Potential decrease in chargeback expense based on sensitivity analysis	3,100
Rebates, administrative fees and others	463,724	367,514	177,518
Product returns	$ 28,285	$ 34,272	$ 20,993
Rebates, administrative and other fees as a percentage of gross sales	16.00%	14.60%
Change in ratio of direct to indirect sales for rebates, administrative and other fees used in sensitivity analysis	3.80%
Potential increase in rebates, administrative and other fees expense based on sensitivity analysis	$ 200
Potential decrease in rebates, administrative and other fees expense based on sensitivity analysis	$ 600
Sales returns as a percentage of gross sales	1.00%	1.40%
Change in lag time to process returns for sales returns reserve used in sensitivity analysis	1 year 2 months 27 days
Potential increase in sales returns expense based on sensitivity analysis	$ 3,700
Potential decrease in sales returns expense based on sensitivity analysis	$ 2,700