Accounts Receivable, Sales and Allowances - Adjustments to Gross Sales (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Receivables [Abstract]
Gross sales	$ 567,112	$ 708,368	$ 1,247,647	$ 1,301,759
Less adjustments for:
Chargebacks	(237,275)	(290,218)	(517,437)	(509,593)
Rebates, administrative and other fees	(109,760)	(102,941)	(234,138)	(191,289)
Product returns	(8,116)	(18,799)	(16,533)	(23,086)
Discounts and allowances	(10,830)	(13,218)	(23,752)	(25,171)
Advertising, promotions and others	(1,991)	(2,458)	(3,227)	(3,539)
Revenues, net	$ 199,140	$ 280,734	$ 452,560	$ 549,081