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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2020
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS |
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | Charged to | ​ | ​ | ​ | ​ | Balance at
​ | ​ | beginning | ​ | cost and | ​ | ​ | ​ | ​ | end of
Description |  | of period |  | expenses |  | Deductions |  | period
Allowance for doubtful accounts, sales returns and cash discounts: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2020 | ​ | $ | 2,045 | ​ | $ | 9,664 | ​ | $ | (9,831) | ​ | $ | 1,878
2019 | ​ | $ | 1,589 | ​ | $ | 9,583 | ​ | $ | (9,127) | ​ | $ | 2,045
2018 | ​ | $ | 1,105 | ​ | $ | 7,890 | ​ | $ | (7,406) | ​ | $ | 1,589
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance on Deferred Tax Assets and Unrecognized Tax Benefits: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2020 | ​ | $ | 43,853 | ​ | $ | (7,860) | ​ | $ | — | ​ | $ | 35,993
2019 | ​ | $ | 42,748 | ​ | $ | 1,105 | ​ | $ | — | ​ | $ | 43,853
2018 | ​ | $ | 40,680 | ​ | $ | 2,068 | ​ | $ | — | ​ | $ | 42,748
​

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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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- References No definition available. + Details
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