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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS AND ALLOWANCE (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for credit losses |  |  |
Changes in valuation and qualifying accounts |  |  |
Balance at beginning of period | $ 6,506 | $ 2,124 | $ 2,437
Charged (credited) to costs and expenses | 9,441 | 4,396 | 812
Credited to other accounts | 35 | (14) | (280)
(Deductions) Adjustments |  |  | (845)
Balance at end of period | 15,982 | 6,506 | 2,124
Tax valuation allowance |  |  |
Changes in valuation and qualifying accounts |  |  |
Balance at beginning of period | 193,788 | 206,630 | 236,332
Charged (credited) to costs and expenses | 4,334 | 1,107 | (1,679)
(Deductions) Adjustments | (8,869) | (13,949) | (28,023)
Balance at end of period | $ 189,253 | $ 193,788 | $ 206,630

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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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- Definition Amount of decrease in 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 D)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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