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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Refund on Estimated Returns and Allowances [Member] |  |  |  |
Valuation and Qualifying Accounts [Roll Forward] |  |  |  |
Balance at beginning of period |  | $ 2,023 | $ 1,950 |
Additions charged to costs and expenses |  | 17,094 | 18,748 |
Deductions | [1] | 16,739 | 18,675 |
Balance at end of period |  | $ 2,378 | 2,023 | $ 1,950
Reserve for Cancelled Sales and Allowances [Member] |  |  |  |
Valuation and Qualifying Accounts [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 1,950 | 2,072
Additions charged to costs and expenses |  |  |  | 19,252
Deductions | [2] |  |  | 19,374
Balance at end of period |  |  |  | $ 1,950
[1] | Refund on estimated returns and allowances: impact of sales cancelled after delivery plus amount of allowance given to customers.
[2] | Reserve for cancelled sales and allowances: impact of sales cancelled after delivery plus amount of allowance given to customers.

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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 -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 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(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: 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(Column C)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: 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(Column D)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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