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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 |  |  |
Movement in Valuation Allowances and Reserves |  |  |
Balance at Beginning of Period | $ 5,181 | $ 4,813 | $ 4,471
Charged to Costs and Expenses | 342 | 1,481 | 588
Net (Deductions) Recoveries | (708) | (1,113) | (246)
Balance at End of Period | 4,815 | 5,181 | 4,813
Deferred tax asset valuation allowance |  |  |
Movement in Valuation Allowances and Reserves |  |  |
Balance at Beginning of Period | 471 | 445 | 3,994
Net (Deductions) Recoveries | 19 | 26 | (3,549)
Balance at End of Period | 490 | 471 | 445
Reserve for obsolete or slow moving inventory |  |  |
Movement in Valuation Allowances and Reserves |  |  |
Balance at Beginning of Period | 10,467 | 10,169 | 3,875
Charged to Costs and Expenses | 5,826 | 6,467 | 8,088
Net (Deductions) Recoveries | (2,464) | (6,169) | (1,794)
Balance at End of Period | $ 13,829 | $ 10,467 | $ 10,169

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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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