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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total unrecognized tax benefits at January 1 | $ 87,294 | $ 33,552 | $ 33,506
Increases due to the Mergers | 103,443 |  | 0
Increases for tax positions related to the current year | 46,978 | 54,823 | 586
Increases for tax positions related to prior years | 2,541 | 178 | 0
Decreases for tax positions related to prior years | (7,100) | (1,259) | (540)
Total unrecognized tax benefits at December 31 | $ 233,156 | $ 87,294 | $ 33,552

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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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