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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 Estimated Credit Losses |  |  |
Movement in Valuation Allowances and Reserves |  |  |
Balance at the Beginning of Period | $ 3,559 | $ 1,486 | $ 960
Additions Charged to Cost and Expense | 1,913 | 2,144 | 589
Write-Offs/Other | (2,254) | (71) | (63)
Balance at End of Period | 3,218 | 3,559 | 1,486
Reserve for Inventory Valuation |  |  |
Movement in Valuation Allowances and Reserves |  |  |
Balance at the Beginning of Period | 33,606 | 20,826 | 18,013
Additions Charged to Cost and Expense | 4,166 | 14,803 | 2,682
Write-Offs/Other | (4,362) | (2,023) | 131
Balance at End of Period | 33,410 | 33,606 | 20,826
Deferred Tax Valuation Allowance |  |  |
Movement in Valuation Allowances and Reserves |  |  |
Balance at the Beginning of Period | 13,303 | 8,098 | 7,823
Additions Charged to Cost and Expense | 23,152 | 5,205 | 275
Write-Offs/Other | 713 | 0 | 0
Balance at End of Period | $ 37,168 | $ 13,303 | $ 8,098

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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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