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Schedule II - Valuation and Qualifying Accounts and Reserves (Notes) | 12 Months Ended
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Dec. 31, 2019
Schedule II - Valuation and Qualifying Accounts and Reserves [Abstract] |
Valuation Allowances and Reserves, Balance | EXHIBITS, FINANCIAL STATEMENT SCHEDULES (a)(1) Financial Statements Reference is made to the information set forth in Part II, Item 8 of this Annual Report on Form 10-K, which information is incorporated herein by reference. (a)(2) Financial Statement Schedules Other than as set forth below, all schedules for which provision is made in the applicable accounting regulations of the SEC have been omitted because they are not required under the related instructions, are not applicable, or the information has been provided in the consolidated financial statements or the notes thereto. Schedule II—Valuation and Qualifying Accounts and Reserves (in thousands)
Description |  | Balance at Beginning of Period |  | Additions Charged to Costs and Expenses |  | Deductions |  | Acquisitions and Other |  | Balance at End of Period
ALLOWANCE FOR DOUBTFUL ACCOUNTS: |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2019 |  | $ | 57,207 |  |  | $ | 12,088 |  |  | $ | (18,308 | ) |  | $ | 1,698 |  |  | $ | 52,685 |
Year ended December 31, 2018 |  | 57,609 |  |  | 13,970 |  |  | (15,945 | ) |  | 1,573 |  |  | 57,207 |
Year ended December 31, 2017 |  | 45,608 |  |  | 15,387 |  |  | (13,012 | ) |  | 9,626 |  |  | 57,609 |
ALLOWANCE FOR ESTIMATED RETURNS, DISCOUNTS & ALLOWANCES: (1) |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2017 |  | $ | 38,345 |  |  | $ | 1,885,517 |  |  | $ | (1,884,250 | ) |  | $ | 2,713 |  |  | $ | 42,325 |
(1) Subsequent to our adoption of ASC 606 in 2018, we present a refund liability and a returns asset within the Consolidated Balance Sheet, whereas in periods prior to adoption, we presented the estimated margin impact of expected returns as a contra-asset within accounts receivable. See Note 5, "Revenue Recognition," to the consolidated financial statements in Part II, Item 8 of this Annual Report on Form 10-K for additional information.

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- Definition Schedule II - Valuation and Qualifying Accounts and Reserves [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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