Accounts Receivable, Sales and Allowances - Adjustments to Gross Sales (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Receivables [Abstract]
Gross sales	$ 586,351	$ 787,808	$ 1,833,998	$ 2,089,567
Less adjustments for:
Chargebacks	(236,701)	(347,106)	(754,137)	(856,699)
Rebates, administrative and other fees	(127,904)	(130,429)	(362,042)	(321,718)
Product returns	(6,187)	(7,970)	(22,721)	(31,056)
Discounts and allowances	(11,343)	(15,014)	(35,095)	(40,185)
Advertising, promotions and others	(1,788)	(3,194)	(5,015)	(6,733)
Revenues, net	$ 202,428	$ 284,095	$ 654,988	$ 833,176