Accounts Receivable, Sales and Allowances - Allowance for Customer Deductions (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Changes in Allowance for Customer Deductions Accounts
Balance	$ 236,021	$ 315,949	$ 259,380
Provision	1,449,550	1,694,774	1,455,730
Additions from acquisitions	0	0	291
Charges processed	(1,448,195)	(1,774,702)	(1,399,452)
Balance	237,376	236,021	315,949
Administrative fees and others	216,086	197,501	162,205
Returns
Changes in Allowance for Customer Deductions Accounts
Balance	43,689	48,333	44,646
Provision	26,874	28,285	34,272
Additions from acquisitions	0	0	0
Charges processed	(28,876)	(32,929)	(30,585)
Balance	41,687	43,689	48,333
Chargebacks
Changes in Allowance for Customer Deductions Accounts
Balance	80,360	91,844	102,438
Provision	953,326	1,218,560	1,065,244
Additions from acquisitions	0	0	0
Charges processed	(959,702)	(1,230,044)	(1,075,838)
Balance	73,984	80,360	91,844
Rebates
Changes in Allowance for Customer Deductions Accounts
Balance	97,935	162,596	95,674
Provision	416,125	384,074	295,787
Additions from acquisitions	0	0	0
Charges processed	(402,115)	(448,735)	(228,865)
Balance	111,945	97,935	162,596
Administrative fees and others	60,500	79,700	71,700
Discounts
Changes in Allowance for Customer Deductions Accounts
Balance	12,389	10,079	15,554
Provision	45,292	55,494	50,384
Additions from acquisitions	0	0	0
Charges processed	(49,902)	(53,184)	(55,859)
Balance	7,779	12,389	10,079
Doubtful Accounts
Changes in Allowance for Customer Deductions Accounts
Balance	960	1,579	309
Provision	0	0	840
Additions from acquisitions	0	0	291
Charges processed	(280)	(619)	139
Balance	680	960	1,579
Advertising & Promotions
Changes in Allowance for Customer Deductions Accounts
Balance	688	1,518	759
Provision	7,933	8,361	9,203
Additions from acquisitions	0	0	0
Charges processed	(7,320)	(9,191)	(8,444)
Balance	$ 1,301	$ 688	$ 1,518

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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- Definition

Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses.

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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