Accounts Receivable, Sales and Allowances (Details) - Net Trade Accounts Receivable - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Gross accounts receivable	$ 519,175	$ 466,570
Less reserves for:
Chargebacks	(80,360)	(91,844)
Rebates	(97,935)	(162,596)
Product returns	(43,689)	(48,333)
Discounts and allowances	(12,389)	(10,079)
Advertising and promotions	(688)	(1,518)
Doubtful accounts	(960)	(1,579)
Trade accounts receivable, net	$ 283,154	$ 150,621