Accounts Receivable, Sales and Allowances - Allowance for Customer Deductions (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in Allowance for Customer Deductions Accounts
Balance	$ 155,179	$ 237,376	$ 236,021
Provision	968,854	1,153,459	1,449,550
Charges processed	(1,000,033)	(1,235,656)	(1,448,195)
Balance	124,000	155,179	237,376
Administrative fees and others	273,871	279,749	216,483
Chargebacks
Changes in Allowance for Customer Deductions Accounts
Balance	55,312	73,984	80,360
Provision	678,204	830,038	953,326
Charges processed	(693,018)	(848,710)	(959,702)
Balance	40,498	55,312	73,984
Rebates
Changes in Allowance for Customer Deductions Accounts
Balance	55,963	111,945	97,935
Provision	218,635	257,417	416,125
Charges processed	(232,083)	(313,399)	(402,115)
Balance	42,515	55,963	111,945
Administrative fees and others	22,900	40,400	60,500
Returns
Changes in Allowance for Customer Deductions Accounts
Balance	35,146	41,687	43,689
Provision	30,699	20,162	26,874
Charges processed	(32,718)	(26,703)	(28,876)
Balance	33,127	35,146	41,687
Discounts
Changes in Allowance for Customer Deductions Accounts
Balance	6,561	7,779	12,389
Provision	32,555	36,933	45,292
Charges processed	(33,300)	(38,151)	(49,902)
Balance	5,816	6,561	7,779
Doubtful Accounts
Changes in Allowance for Customer Deductions Accounts
Balance	623	680	960
Provision	0	0	0
Charges processed	(87)	(57)	(280)
Balance	536	623	680
Advertising & Promotions
Changes in Allowance for Customer Deductions Accounts
Balance	1,574	1,301	688
Provision	8,761	8,909	7,933
Charges processed	(8,827)	(8,636)	(7,320)
Balance	$ 1,508	$ 1,574	$ 1,301

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
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- Definition

Amount of valuation and qualifying accounts and reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 4
-Subparagraph (SX 210.12-09)
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Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense.

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Amount of decrease in valuation and qualifying accounts and reserves.

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