Accounts Receivable, Sales and Allowances - Net Trade Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Net Trade Accounts Receivable [Abstract]
Gross accounts receivable	$ 466,570	$ 426,002	$ 392,015	$ 414,757	$ 446,925	$ 293,113	$ 213,392	$ 93,201	$ 88,165
Less reserves for:
Chargebacks and rebates	(254,440)	(217,602)	(193,683)	(162,249)	(198,112)	(116,997)	(58,312)	(18,095)	(12,882)
Product returns	(48,333)	(53,910)	(51,195)	(47,578)	(44,646)	(38,266)	(20,492)	(7,378)	(8,164)
Discounts and allowances	(10,079)	(13,420)	(14,801)	(13,503)	(15,554)	(8,753)	(5,155)	(1,798)	(1,644)
Advertising and promotions	(1,518)	(826)	(924)	(440)	(758)	(1,031)	(566)	(391)	(452)
Doubtful accounts	(1,579)	(1,324)	(600)	(277)	(309)	(94)	(93)	(39)	(25)
Trade accounts receivable, net	$ 150,621	$ 138,920	$ 130,812	$ 190,710	$ 187,545	$ 127,972	$ 128,774	$ 65,500	$ 64,998