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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
Allowance for doubtful accounts, sales returns and cash discounts |  |  |
Changes to valuation allowance |  |  |
Balance at beginning of period | $ 2,045 | $ 1,589 | $ 1,105
Charged to cost and expenses | 9,664 | 9,583 | 7,890
Deductions | (9,831) | (9,127) | (7,406)
Balance at end of period | 1,878 | 2,045 | 1,589
Allowance on Deferred Tax Assets and Unrecognized Tax Benefits |  |  |
Changes to valuation allowance |  |  |
Balance at beginning of period | 43,853 | 42,748 | 40,680
Charged to cost and expenses | (7,860) | 1,105 | 2,068
Balance at end of period | $ 35,993 | $ 43,853 | $ 42,748

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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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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