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Income Taxes - Summary of Valuation Allowance (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Valuation Allowance [Line Items] |  |
Valuation allowance | $ 2,986,684 | $ 2,759,431
Foreign tax credits |  |
Valuation Allowance [Line Items] |  |
Valuation allowance | 2,540,400 | 2,509,786
Disallowed interest expense carryforwards |  |
Valuation Allowance [Line Items] |  |
Valuation allowance | 138,339 | 88,318
Intangible assets |  |
Valuation Allowance [Line Items] |  |
Valuation allowance | 48,395 | 0
U.S. loss carryforwards |  |
Valuation Allowance [Line Items] |  |
Valuation allowance | 45,015 | 0
Other U.S. deferred tax assets |  |
Valuation Allowance [Line Items] |  |
Valuation allowance | 40,659 | 6,393
Foreign loss carryforwards |  |
Valuation Allowance [Line Items] |  |
Valuation allowance | 106,737 | 96,657
Other foreign deferred tax assets |  |
Valuation Allowance [Line Items] |  |
Valuation allowance | $ 67,139 | $ 58,277

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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