Accounts Receivable, Sales and Allowances - Allowance for Customer Deductions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in Allowance for Customer Deductions Accounts
Balance	$ 237,376	$ 236,021	$ 315,949
Provision	1,153,459	1,449,550	1,694,774
Charges processed	(1,235,656)	(1,448,195)	(1,774,702)
Balance	155,179	237,376	236,021
Administrative fees and others	279,628	216,324	197,631
Returns
Changes in Allowance for Customer Deductions Accounts
Balance	41,687	43,689	48,333
Provision	20,162	26,874	28,285
Charges processed	(26,703)	(28,876)	(32,929)
Balance	35,146	41,687	43,689
Chargebacks
Changes in Allowance for Customer Deductions Accounts
Balance	73,984	80,360	91,844
Provision	830,038	953,326	1,218,560
Charges processed	(848,710)	(959,702)	(1,230,044)
Balance	55,312	73,984	80,360
Rebates
Changes in Allowance for Customer Deductions Accounts
Balance	111,945	97,935	162,596
Provision	257,417	416,125	384,074
Charges processed	(313,399)	(402,115)	(448,735)
Balance	55,963	111,945	97,935
Administrative fees and others	40,400	60,500	79,700
Discounts
Changes in Allowance for Customer Deductions Accounts
Balance	7,779	12,389	10,079
Provision	36,933	45,292	55,494
Charges processed	(38,151)	(49,902)	(53,184)
Balance	6,561	7,779	12,389
Doubtful Accounts
Changes in Allowance for Customer Deductions Accounts
Balance	680	960	1,579
Provision	0	0	0
Charges processed	(57)	(280)	(619)
Balance	623	680	960
Advertising & Promotions
Changes in Allowance for Customer Deductions Accounts
Balance	1,301	688	1,518
Provision	8,909	7,933	8,361
Charges processed	(8,636)	(7,320)	(9,191)
Balance	$ 1,574	$ 1,301	$ 688