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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Allowance for doubtful accounts, sales returns and cash discounts |  |  |
Changes to valuation allowance |  |  |
Balance at beginning of period | $ 1,878 | $ 2,045 | $ 1,589
Charged to cost and expenses | 14,799 | 9,664 | 9,583
Deductions | (12,001) | (9,831) | (9,127)
Balance at end of period | 4,676 | 1,878 | 2,045
Allowance on Deferred Tax Assets and Unrecognized Tax Benefits |  |  |
Changes to valuation allowance |  |  |
Balance at beginning of period | 35,993 | 43,853 | 42,748
Charged to cost and expenses | (8,980) | (7,860) | 1,105
Balance at end of period | $ 27,013 | $ 35,993 | $ 43,853

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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 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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