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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS - Deferred Tax Asset Valuation Allowance (Details) - Deferred Tax Asset Valuation Allowance - USD ($) $ in Thousands | 3 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2020 | May 01, 2019 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2018
Movement in Valuation Allowances and Reserves |  |  |  |  |
Balance at Beginning of Period |  | $ 693,541 | $ 719,486 | $ 720,622 | $ 678,118
Charges to Costs, Expenses and Other |  | 714,520 | 1,870 | 3,047 | 11,277
Reversal |  | (316,374) | (734) | (444) | 0
Impact of fresh start accounting |  | (343,662) | 0 | 0 | 0
Adjustments | $ 1,100,000 | (28,539) | 0 | 1,094,866 | 4,146
Balance at End of Period | $ 1,818,091 | $ 719,486 | $ 720,622 | $ 1,818,091 | $ 693,541

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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=120395691&loc=d3e24092-122690 + Details
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