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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Allowance for doubtful accounts receivable and revenue adjustments |  |  |
Changes in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | $ 7,851 | $ 5,448 | $ 7,380
Additions, Charged to Costs and Expenses | 1,466 | 4,327 | 1,223
Additions, Charged to Other Accounts | 7,788 | 1,887 | (245)
Deductions | 3,879 | 3,811 | 2,910
Balance at End of Period | 13,226 | 7,851 | 5,448
Allowance for other accounts receivable |  |  |
Changes in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | 660 | 476 | 806
Additions, Charged to Costs and Expenses | 30 | (14) | (330)
Additions, Charged to Other Accounts |  | 198 |
Balance at End of Period | 690 | 660 | 476
Allowance for deferred tax assets |  |  |
Changes in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | 1,284 | 668 | 53
Deductions | (912) | (616) | (615)
Balance at End of Period | $ 2,196 | $ 1,284 | $ 668

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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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