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Income Taxes - Loss Carryforwards and Other (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 01, 2020
Operating loss carryforwards |  |  |  |  |  |
Federal deferred tax assets net operating loss carryforwards |  |  | $ 9,400 |  |  |
State deferred tax assets net operating loss carryforwards |  |  | 2,700 |  |  |
Net deferred tax assets |  |  | 79,746 | $ 61,557 |  |
Reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding accrued interest and penalties |  |  |  |  |  |
Balance at beginning of year |  |  | 10,199 | 2,966 | $ 8,929 |
Additions based on tax positions related to prior years | $ 26,400 | $ 7,300 | 26,858 | 7,473 | 2,726 |
Reductions for tax positions related to prior years |  |  |  | (240) | (8,689) |
Reductions for settlements with tax authorities |  | (8,300) | (8,301) |  |  |
Balance at end of year |  |  | 28,756 | 10,199 | 2,966 |
Interest and penalties accrued |  |  | 0 | 0 | 600 |
Reduced provision for income taxes |  | $ 8,300 | 8,301 |  |  |
Federal |  |  |  |  |  |
Operating loss carryforwards |  |  |  |  |  |
Net operating loss carryforwards |  |  | 44,900 |  |  | $ 53,200
State |  |  |  |  |  |
Operating loss carryforwards |  |  |  |  |  |
Net operating loss carryforwards |  |  | 46,200 |  |  | $ 6,500
Increase in valuation allowance |  |  | 500 |  |  |
Net deferred tax assets |  |  | 2,200 |  |  |
Maximum |  |  |  |  |  |
Reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding accrued interest and penalties |  |  |  |  |  |
Decrease in unrecognized tax benefits |  |  | $ 28,800 |  |  |

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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